Moderate severityNVD Advisory· Published Feb 8, 2021· Updated Aug 3, 2024

Denial of Service in Marked

CVE-2021-21306

Description

Marked is an open-source markdown parser and compiler (npm package "marked"). In marked from version 1.1.1 and before version 2.0.0, there is a Regular expression Denial of Service vulnerability. This vulnerability can affect anyone who runs user generated code through marked. This vulnerability is fixed in version 2.0.0.

Affected packages

Versions sourced from the GitHub Security Advisory.

Package	Affected versions	Patched versions
markednpm	>= 1.1.1, < 2.0.0	2.0.0

Affected products

Marked Project/Markedv5
Range: >= 1.1.1, < 2.0.0

Patches

7293251c438e

fix: Total rework of Emphasis/Strong (#1864)

https://github.com/markedjs/markedTrevor BucknerFeb 7, 2021via ghsa

commit

14 files changed · +280 −372

lib/marked.esm.js+73 −91 modified

@@ -839,46 +839,61 @@ var Tokenizer_1 = class Tokenizer {
     }
   }
 
-  strong(src, maskedSrc, prevChar = '') {
-    let match = this.rules.inline.strong.start.exec(src);
+  emStrong(src, maskedSrc, prevChar = '') {
+    let match = this.rules.inline.emStrong.lDelim.exec(src);
+    if (!match) return;
 
-    if (match && (!match[1] || (match[1] && (prevChar === '' || this.rules.inline.punctuation.exec(prevChar))))) {
-      maskedSrc = maskedSrc.slice(-1 * src.length);
-      const endReg = match[0] === '**' ? this.rules.inline.strong.endAst : this.rules.inline.strong.endUnd;
+    if (match[3] && prevChar.match(/[\p{L}\p{N}]/u)) return; // _ can't be between two alphanumerics. \p{L}\p{N} includes non-english alphabet/numbers as well
 
+    const nextChar = match[1] || match[2] || '';
+
+    if (!nextChar || (nextChar && (prevChar === '' || this.rules.inline.punctuation.exec(prevChar)))) {
+      const lLength = match[0].length - 1;
+      let rDelim, rLength, delimTotal = lLength, midDelimTotal = 0;
+
+      const endReg = match[0][0] === '*' ? this.rules.inline.emStrong.rDelimAst : this.rules.inline.emStrong.rDelimUnd;
       endReg.lastIndex = 0;
 
-      let cap;
+      maskedSrc = maskedSrc.slice(-1 * src.length + lLength); // Bump maskedSrc to same section of string as src (move to lexer?)
+
       while ((match = endReg.exec(maskedSrc)) != null) {
-        cap = this.rules.inline.strong.middle.exec(maskedSrc.slice(0, match.index + 3));
-        if (cap) {
-          return {
-            type: 'strong',
-            raw: src.slice(0, cap[0].length),
-            text: src.slice(2, cap[0].length - 2)
-          };
+        rDelim = match[1] || match[2] || match[3] || match[4] || match[5] || match[6];
+
+        if (!rDelim) continue; // matched the first alternative in rules.js (skip the * in __abc*abc__)
+
+        rLength = rDelim.length;
+
+        if (match[3] || match[4]) { // found another Left Delim
+          delimTotal += rLength;
+          continue;
+        } else if (match[5] || match[6]) { // either Left or Right Delim
+          if (lLength % 3 && !((lLength + rLength) % 3)) {
+            midDelimTotal += rLength;
+            continue; // CommonMark Emphasis Rules 9-10
+          }
         }
-      }
-    }
-  }
 
-  em(src, maskedSrc, prevChar = '') {
-    let match = this.rules.inline.em.start.exec(src);
+        delimTotal -= rLength;
 
-    if (match && (!match[1] || (match[1] && (prevChar === '' || this.rules.inline.punctuation.exec(prevChar))))) {
-      maskedSrc = maskedSrc.slice(-1 * src.length);
-      const endReg = match[0] === '*' ? this.rules.inline.em.endAst : this.rules.inline.em.endUnd;
+        if (delimTotal > 0) continue; // Haven't found enough closing delimiters
 
-      endReg.lastIndex = 0;
+        // If this is the last rDelimiter, remove extra characters. *a*** -> *a*
+        if (delimTotal + midDelimTotal - rLength <= 0 && !maskedSrc.slice(endReg.lastIndex).match(endReg)) {
+          rLength = Math.min(rLength, rLength + delimTotal + midDelimTotal);
+        }
 
-      let cap;
-      while ((match = endReg.exec(maskedSrc)) != null) {
-        cap = this.rules.inline.em.middle.exec(maskedSrc.slice(0, match.index + 2));
-        if (cap) {
+        if (Math.min(lLength, rLength) % 2) {
           return {
             type: 'em',
-            raw: src.slice(0, cap[0].length),
-            text: src.slice(1, cap[0].length - 1)
+            raw: src.slice(0, lLength + match.index + rLength + 1),
+            text: src.slice(1, lLength + match.index + rLength)
+          };
+        }
+        if (Math.min(lLength, rLength) % 2 === 0) {
+          return {
+            type: 'strong',
+            raw: src.slice(0, lLength + match.index + rLength + 1),
+            text: src.slice(2, lLength + match.index + rLength - 1)
           };
         }
       }
@@ -1182,74 +1197,41 @@ const inline = {
   reflink: /^!?\[(label)\]\[(?!\s*\])((?:\\[\[\]]?|[^\[\]\\])+)\]/,
   nolink: /^!?\[(?!\s*\])((?:\[[^\[\]]*\]|\\[\[\]]|[^\[\]])*)\](?:\[\])?/,
   reflinkSearch: 'reflink|nolink(?!\\()',
-  strong: {
-    start: /^(?:(\*\*(?=[*punctuation]))|\*\*)(?![\s])|__/, // (1) returns if starts w/ punctuation
-    middle: /^\*\*(?:(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)|\*(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)*?\*)+?\*\*$|^__(?![\s])((?:(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)|_(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)*?_)+?)__$/,
-    endAst: /[^punctuation\s]\*\*(?!\*)|[punctuation]\*\*(?!\*)(?:(?=[punctuation_\s]|$))/, // last char can't be punct, or final * must also be followed by punct (or endline)
-    endUnd: /[^\s]__(?!_)(?:(?=[punctuation*\s])|$)/ // last char can't be a space, and final _ must preceed punct or \s (or endline)
-  },
-  em: {
-    start: /^(?:(\*(?=[punctuation]))|\*)(?![*\s])|_/, // (1) returns if starts w/ punctuation
-    middle: /^\*(?:(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)|\*(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)*?\*)+?\*$|^_(?![_\s])(?:(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)|_(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)*?_)+?_$/,
-    endAst: /[^punctuation\s]\*(?!\*)|[punctuation]\*(?!\*)(?:(?=[punctuation_\s]|$))/, // last char can't be punct, or final * must also be followed by punct (or endline)
-    endUnd: /[^\s]_(?!_)(?:(?=[punctuation*\s])|$)/ // last char can't be a space, and final _ must preceed punct or \s (or endline)
+  emStrong: {
+    lDelim: /^(?:\*+(?:([punct_])|[^\s*]))|^_+(?:([punct*])|([^\s_]))/,
+    //        (1) and (2) can only be a Right Delimiter. (3) and (4) can only be Left.  (5) and (6) can be either Left or Right.
+    //        () Skip other delimiter (1) #***                (2) a***#, a***                   (3) #***a, ***a                 (4) ***#              (5) #***#                 (6) a***a
+    rDelimAst: /\_\_[^_]*?\*[^_]*?\_\_|[punct_](\*+)(?=[\s]|$)|[^punct*_\s](\*+)(?=[punct_\s]|$)|[punct_\s](\*+)(?=[^punct*_\s])|[\s](\*+)(?=[punct_])|[punct_](\*+)(?=[punct_])|[^punct*_\s](\*+)(?=[^punct*_\s])/,
+    rDelimUnd: /\*\*[^*]*?\_[^*]*?\*\*|[punct*](\_+)(?=[\s]|$)|[^punct*_\s](\_+)(?=[punct*\s]|$)|[punct*\s](\_+)(?=[^punct*_\s])|[\s](\_+)(?=[punct*])|[punct*](\_+)(?=[punct*])/ // ^- Not allowed for _
   },
   code: /^(`+)([^`]|[^`][\s\S]*?[^`])\1(?!`)/,
   br: /^( {2,}|\\)\n(?!\s*$)/,
   del: noopTest$1,
-  text: /^(`+|[^`])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*]|\b_|$)|[^ ](?= {2,}\n)))/,
-  punctuation: /^([\s*punctuation])/
+  text: /^(`+|[^`])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*_]|\b_|$)|[^ ](?= {2,}\n)))/,
+  punctuation: /^([\spunctuation])/
 };
 
-// list of punctuation marks from common mark spec
-// without * and _ to workaround cases with double emphasis
+// list of punctuation marks from CommonMark spec
+// without * and _ to handle the different emphasis markers * and _
 inline._punctuation = '!"#$%&\'()+\\-.,/:;<=>?@\\[\\]`^{|}~';
 inline.punctuation = edit$1(inline.punctuation).replace(/punctuation/g, inline._punctuation).getRegex();
 
 // sequences em should skip over [title](link), `code`, <html>
-inline._blockSkip = '\\[[^\\]]*?\\]\\([^\\)]*?\\)|`[^`]*?`|<[^>]*?>';
-inline._overlapSkip = '__[^_]*?__|\\*\\*\\[^\\*\\]*?\\*\\*';
+inline.blockSkip = /\[[^\]]*?\]\([^\)]*?\)|`[^`]*?`|<[^>]*?>/g;
+inline.escapedEmSt = /\\\*|\\_/g;
 
 inline._comment = edit$1(block._comment).replace('(?:-->|$)', '-->').getRegex();
 
-inline.em.start = edit$1(inline.em.start)
-  .replace(/punctuation/g, inline._punctuation)
+inline.emStrong.lDelim = edit$1(inline.emStrong.lDelim)
+  .replace(/punct/g, inline._punctuation)
   .getRegex();
 
-inline.em.middle = edit$1(inline.em.middle)
-  .replace(/punctuation/g, inline._punctuation)
-  .replace(/overlapSkip/g, inline._overlapSkip)
+inline.emStrong.rDelimAst = edit$1(inline.emStrong.rDelimAst, 'g')
+  .replace(/punct/g, inline._punctuation)
   .getRegex();
 
-inline.em.endAst = edit$1(inline.em.endAst, 'g')
-  .replace(/punctuation/g, inline._punctuation)
-  .getRegex();
-
-inline.em.endUnd = edit$1(inline.em.endUnd, 'g')
-  .replace(/punctuation/g, inline._punctuation)
-  .getRegex();
-
-inline.strong.start = edit$1(inline.strong.start)
-  .replace(/punctuation/g, inline._punctuation)
-  .getRegex();
-
-inline.strong.middle = edit$1(inline.strong.middle)
-  .replace(/punctuation/g, inline._punctuation)
-  .replace(/overlapSkip/g, inline._overlapSkip)
-  .getRegex();
-
-inline.strong.endAst = edit$1(inline.strong.endAst, 'g')
-  .replace(/punctuation/g, inline._punctuation)
-  .getRegex();
-
-inline.strong.endUnd = edit$1(inline.strong.endUnd, 'g')
-  .replace(/punctuation/g, inline._punctuation)
-  .getRegex();
-
-inline.blockSkip = edit$1(inline._blockSkip, 'g')
-  .getRegex();
-
-inline.overlapSkip = edit$1(inline._overlapSkip, 'g')
+inline.emStrong.rDelimUnd = edit$1(inline.emStrong.rDelimUnd, 'g')
+  .replace(/punct/g, inline._punctuation)
   .getRegex();
 
 inline._escapes = /\\([!"#$%&'()*+,\-./:;<=>?@\[\]\\^_`{|}~])/g;
@@ -1328,7 +1310,7 @@ inline.gfm = merge$1({}, inline.normal, {
   url: /^((?:ftp|https?):\/\/|www\.)(?:[a-zA-Z0-9\-]+\.?)+[^\s<]*|^email/,
   _backpedal: /(?:[^?!.,:;*_~()&]+|\([^)]*\)|&(?![a-zA-Z0-9]+;$)|[?!.,:;*_~)]+(?!$))+/,
   del: /^(~~?)(?=[^\s~])([\s\S]*?[^\s~])\1(?=[^~]|$)/,
-  text: /^([`~]+|[^`~])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*~]|\b_|https?:\/\/|ftp:\/\/|www\.|$)|[^ ](?= {2,}\n)|[^a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-](?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))|(?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))/
+  text: /^([`~]+|[^`~])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*~_]|\b_|https?:\/\/|ftp:\/\/|www\.|$)|[^ ](?= {2,}\n)|[^a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-](?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))|(?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))/
 });
 
 inline.gfm.url = edit$1(inline.gfm.url, 'i')
@@ -1704,11 +1686,17 @@ var Lexer_1 = class Lexer {
       maskedSrc = maskedSrc.slice(0, match.index) + '[' + repeatString$1('a', match[0].length - 2) + ']' + maskedSrc.slice(this.tokenizer.rules.inline.blockSkip.lastIndex);
     }
 
+    // Mask out escaped em & strong delimiters
+    while ((match = this.tokenizer.rules.inline.escapedEmSt.exec(maskedSrc)) != null) {
+      maskedSrc = maskedSrc.slice(0, match.index) + '++' + maskedSrc.slice(this.tokenizer.rules.inline.escapedEmSt.lastIndex);
+    }
+
     while (src) {
       if (!keepPrevChar) {
         prevChar = '';
       }
       keepPrevChar = false;
+
       // escape
       if (token = this.tokenizer.escape(src)) {
         src = src.substring(token.raw.length);
@@ -1757,16 +1745,8 @@ var Lexer_1 = class Lexer {
         continue;
       }
 
-      // strong
-      if (token = this.tokenizer.strong(src, maskedSrc, prevChar)) {
-        src = src.substring(token.raw.length);
-        token.tokens = this.inlineTokens(token.text, [], inLink, inRawBlock);
-        tokens.push(token);
-        continue;
-      }
-
-      // em
-      if (token = this.tokenizer.em(src, maskedSrc, prevChar)) {
+      // em & strong
+      if (token = this.tokenizer.emStrong(src, maskedSrc, prevChar)) {
         src = src.substring(token.raw.length);
         token.tokens = this.inlineTokens(token.text, [], inLink, inRawBlock);
         tokens.push(token);
@@ -1812,7 +1792,9 @@ var Lexer_1 = class Lexer {
       // text
       if (token = this.tokenizer.inlineText(src, inRawBlock, smartypants)) {
         src = src.substring(token.raw.length);
-        prevChar = token.raw.slice(-1);
+        if (token.raw.slice(-1) !== '_') { // Track prevChar before string of ____ started
+          prevChar = token.raw.slice(-1);
+        }
         keepPrevChar = true;
         lastToken = tokens[tokens.length - 1];
         if (lastToken && lastToken.type === 'text') {

lib/marked.js+75 −78 modified

@@ -937,54 +937,66 @@
       }
     };
 
-    _proto.strong = function strong(src, maskedSrc, prevChar) {
+    _proto.emStrong = function emStrong(src, maskedSrc, prevChar) {
       if (prevChar === void 0) {
         prevChar = '';
       }
 
-      var match = this.rules.inline.strong.start.exec(src);
+      var match = this.rules.inline.emStrong.lDelim.exec(src);
+      if (!match) return;
+      if (match[3] && prevChar.match(/(?:[0-9A-Za-z\xAA\xB2\xB3\xB5\xB9\xBA\xBC-\xBE\xC0-\xD6\xD8-\xF6\xF8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377\u037A-\u037D\u037F\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u052F\u0531-\u0556\u0559\u0560-\u0588\u05D0-\u05EA\u05EF-\u05F2\u0620-\u064A\u0660-\u0669\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07C0-\u07EA\u07F4\u07F5\u07FA\u0800-\u0815\u081A\u0824\u0828\u0840-\u0858\u0860-\u086A\u08A0-\u08B4\u08B6-\u08C7\u0904-\u0939\u093D\u0950\u0958-\u0961\u0966-\u096F\u0971-\u0980\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BD\u09CE\u09DC\u09DD\u09DF-\u09E1\u09E6-\u09F1\u09F4-\u09F9\u09FC\u0A05-\u0A0A\u0A0F\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32\u0A33\u0A35\u0A36\u0A38\u0A39\u0A59-\u0A5C\u0A5E\u0A66-\u0A6F\u0A72-\u0A74\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2\u0AB3\u0AB5-\u0AB9\u0ABD\u0AD0\u0AE0\u0AE1\u0AE6-\u0AEF\u0AF9\u0B05-\u0B0C\u0B0F\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32\u0B33\u0B35-\u0B39\u0B3D\u0B5C\u0B5D\u0B5F-\u0B61\u0B66-\u0B6F\u0B71-\u0B77\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99\u0B9A\u0B9C\u0B9E\u0B9F\u0BA3\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BD0\u0BE6-\u0BF2\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C39\u0C3D\u0C58-\u0C5A\u0C60\u0C61\u0C66-\u0C6F\u0C78-\u0C7E\u0C80\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3\u0CB5-\u0CB9\u0CBD\u0CDE\u0CE0\u0CE1\u0CE6-\u0CEF\u0CF1\u0CF2\u0D04-\u0D0C\u0D0E-\u0D10\u0D12-\u0D3A\u0D3D\u0D4E\u0D54-\u0D56\u0D58-\u0D61\u0D66-\u0D78\u0D7A-\u0D7F\u0D85-\u0D96\u0D9A-\u0DB1\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0DE6-\u0DEF\u0E01-\u0E30\u0E32\u0E33\u0E40-\u0E46\u0E50-\u0E59\u0E81\u0E82\u0E84\u0E86-\u0E8A\u0E8C-\u0EA3\u0EA5\u0EA7-\u0EB0\u0EB2\u0EB3\u0EBD\u0EC0-\u0EC4\u0EC6\u0ED0-\u0ED9\u0EDC-\u0EDF\u0F00\u0F20-\u0F33\u0F40-\u0F47\u0F49-\u0F6C\u0F88-\u0F8C\u1000-\u102A\u103F-\u1049\u1050-\u1055\u105A-\u105D\u1061\u1065\u1066\u106E-\u1070\u1075-\u1081\u108E\u1090-\u1099\u10A0-\u10C5\u10C7\u10CD\u10D0-\u10FA\u10FC-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310\u1312-\u1315\u1318-\u135A\u1369-\u137C\u1380-\u138F\u13A0-\u13F5\u13F8-\u13FD\u1401-\u166C\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u16EE-\u16F8\u1700-\u170C\u170E-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3\u17D7\u17DC\u17E0-\u17E9\u17F0-\u17F9\u1810-\u1819\u1820-\u1878\u1880-\u1884\u1887-\u18A8\u18AA\u18B0-\u18F5\u1900-\u191E\u1946-\u196D\u1970-\u1974\u1980-\u19AB\u19B0-\u19C9\u19D0-\u19DA\u1A00-\u1A16\u1A20-\u1A54\u1A80-\u1A89\u1A90-\u1A99\u1AA7\u1B05-\u1B33\u1B45-\u1B4B\u1B50-\u1B59\u1B83-\u1BA0\u1BAE-\u1BE5\u1C00-\u1C23\u1C40-\u1C49\u1C4D-\u1C7D\u1C80-\u1C88\u1C90-\u1CBA\u1CBD-\u1CBF\u1CE9-\u1CEC\u1CEE-\u1CF3\u1CF5\u1CF6\u1CFA\u1D00-\u1DBF\u1E00-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u2070\u2071\u2074-\u2079\u207F-\u2089\u2090-\u209C\u2102\u2107\u210A-\u2113\u2115\u2119-\u211D\u2124\u2126\u2128\u212A-\u212D\u212F-\u2139\u213C-\u213F\u2145-\u2149\u214E\u2150-\u2189\u2460-\u249B\u24EA-\u24FF\u2776-\u2793\u2C00-\u2C2E\u2C30-\u2C5E\u2C60-\u2CE4\u2CEB-\u2CEE\u2CF2\u2CF3\u2CFD\u2D00-\u2D25\u2D27\u2D2D\u2D30-\u2D67\u2D6F\u2D80-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE\u2DD0-\u2DD6\u2DD8-\u2DDE\u2E2F\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303C\u3041-\u3096\u309D-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312F\u3131-\u318E\u3192-\u3195\u31A0-\u31BF\u31F0-\u31FF\u3220-\u3229\u3248-\u324F\u3251-\u325F\u3280-\u3289\u32B1-\u32BF\u3400-\u4DBF\u4E00-\u9FFC\uA000-\uA48C\uA4D0-\uA4FD\uA500-\uA60C\uA610-\uA62B\uA640-\uA66E\uA67F-\uA69D\uA6A0-\uA6EF\uA717-\uA71F\uA722-\uA788\uA78B-\uA7BF\uA7C2-\uA7CA\uA7F5-\uA801\uA803-\uA805\uA807-\uA80A\uA80C-\uA822\uA830-\uA835\uA840-\uA873\uA882-\uA8B3\uA8D0-\uA8D9\uA8F2-\uA8F7\uA8FB\uA8FD\uA8FE\uA900-\uA925\uA930-\uA946\uA960-\uA97C\uA984-\uA9B2\uA9CF-\uA9D9\uA9E0-\uA9E4\uA9E6-\uA9FE\uAA00-\uAA28\uAA40-\uAA42\uAA44-\uAA4B\uAA50-\uAA59\uAA60-\uAA76\uAA7A\uAA7E-\uAAAF\uAAB1\uAAB5\uAAB6\uAAB9-\uAABD\uAAC0\uAAC2\uAADB-\uAADD\uAAE0-\uAAEA\uAAF2-\uAAF4\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E\uAB30-\uAB5A\uAB5C-\uAB69\uAB70-\uABE2\uABF0-\uABF9\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA6D\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D\uFB1F-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40\uFB41\uFB43\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE70-\uFE74\uFE76-\uFEFC\uFF10-\uFF19\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC]|\uD800[\uDC00-\uDC0B\uDC0D-\uDC26\uDC28-\uDC3A\uDC3C\uDC3D\uDC3F-\uDC4D\uDC50-\uDC5D\uDC80-\uDCFA\uDD07-\uDD33\uDD40-\uDD78\uDD8A\uDD8B\uDE80-\uDE9C\uDEA0-\uDED0\uDEE1-\uDEFB\uDF00-\uDF23\uDF2D-\uDF4A\uDF50-\uDF75\uDF80-\uDF9D\uDFA0-\uDFC3\uDFC8-\uDFCF\uDFD1-\uDFD5]|\uD801[\uDC00-\uDC9D\uDCA0-\uDCA9\uDCB0-\uDCD3\uDCD8-\uDCFB\uDD00-\uDD27\uDD30-\uDD63\uDE00-\uDF36\uDF40-\uDF55\uDF60-\uDF67]|\uD802[\uDC00-\uDC05\uDC08\uDC0A-\uDC35\uDC37\uDC38\uDC3C\uDC3F-\uDC55\uDC58-\uDC76\uDC79-\uDC9E\uDCA7-\uDCAF\uDCE0-\uDCF2\uDCF4\uDCF5\uDCFB-\uDD1B\uDD20-\uDD39\uDD80-\uDDB7\uDDBC-\uDDCF\uDDD2-\uDE00\uDE10-\uDE13\uDE15-\uDE17\uDE19-\uDE35\uDE40-\uDE48\uDE60-\uDE7E\uDE80-\uDE9F\uDEC0-\uDEC7\uDEC9-\uDEE4\uDEEB-\uDEEF\uDF00-\uDF35\uDF40-\uDF55\uDF58-\uDF72\uDF78-\uDF91\uDFA9-\uDFAF]|\uD803[\uDC00-\uDC48\uDC80-\uDCB2\uDCC0-\uDCF2\uDCFA-\uDD23\uDD30-\uDD39\uDE60-\uDE7E\uDE80-\uDEA9\uDEB0\uDEB1\uDF00-\uDF27\uDF30-\uDF45\uDF51-\uDF54\uDFB0-\uDFCB\uDFE0-\uDFF6]|\uD804[\uDC03-\uDC37\uDC52-\uDC6F\uDC83-\uDCAF\uDCD0-\uDCE8\uDCF0-\uDCF9\uDD03-\uDD26\uDD36-\uDD3F\uDD44\uDD47\uDD50-\uDD72\uDD76\uDD83-\uDDB2\uDDC1-\uDDC4\uDDD0-\uDDDA\uDDDC\uDDE1-\uDDF4\uDE00-\uDE11\uDE13-\uDE2B\uDE80-\uDE86\uDE88\uDE8A-\uDE8D\uDE8F-\uDE9D\uDE9F-\uDEA8\uDEB0-\uDEDE\uDEF0-\uDEF9\uDF05-\uDF0C\uDF0F\uDF10\uDF13-\uDF28\uDF2A-\uDF30\uDF32\uDF33\uDF35-\uDF39\uDF3D\uDF50\uDF5D-\uDF61]|\uD805[\uDC00-\uDC34\uDC47-\uDC4A\uDC50-\uDC59\uDC5F-\uDC61\uDC80-\uDCAF\uDCC4\uDCC5\uDCC7\uDCD0-\uDCD9\uDD80-\uDDAE\uDDD8-\uDDDB\uDE00-\uDE2F\uDE44\uDE50-\uDE59\uDE80-\uDEAA\uDEB8\uDEC0-\uDEC9\uDF00-\uDF1A\uDF30-\uDF3B]|\uD806[\uDC00-\uDC2B\uDCA0-\uDCF2\uDCFF-\uDD06\uDD09\uDD0C-\uDD13\uDD15\uDD16\uDD18-\uDD2F\uDD3F\uDD41\uDD50-\uDD59\uDDA0-\uDDA7\uDDAA-\uDDD0\uDDE1\uDDE3\uDE00\uDE0B-\uDE32\uDE3A\uDE50\uDE5C-\uDE89\uDE9D\uDEC0-\uDEF8]|\uD807[\uDC00-\uDC08\uDC0A-\uDC2E\uDC40\uDC50-\uDC6C\uDC72-\uDC8F\uDD00-\uDD06\uDD08\uDD09\uDD0B-\uDD30\uDD46\uDD50-\uDD59\uDD60-\uDD65\uDD67\uDD68\uDD6A-\uDD89\uDD98\uDDA0-\uDDA9\uDEE0-\uDEF2\uDFB0\uDFC0-\uDFD4]|\uD808[\uDC00-\uDF99]|\uD809[\uDC00-\uDC6E\uDC80-\uDD43]|[\uD80C\uD81C-\uD820\uD822\uD840-\uD868\uD86A-\uD86C\uD86F-\uD872\uD874-\uD879\uD880-\uD883][\uDC00-\uDFFF]|\uD80D[\uDC00-\uDC2E]|\uD811[\uDC00-\uDE46]|\uD81A[\uDC00-\uDE38\uDE40-\uDE5E\uDE60-\uDE69\uDED0-\uDEED\uDF00-\uDF2F\uDF40-\uDF43\uDF50-\uDF59\uDF5B-\uDF61\uDF63-\uDF77\uDF7D-\uDF8F]|\uD81B[\uDE40-\uDE96\uDF00-\uDF4A\uDF50\uDF93-\uDF9F\uDFE0\uDFE1\uDFE3]|\uD821[\uDC00-\uDFF7]|\uD823[\uDC00-\uDCD5\uDD00-\uDD08]|\uD82C[\uDC00-\uDD1E\uDD50-\uDD52\uDD64-\uDD67\uDD70-\uDEFB]|\uD82F[\uDC00-\uDC6A\uDC70-\uDC7C\uDC80-\uDC88\uDC90-\uDC99]|\uD834[\uDEE0-\uDEF3\uDF60-\uDF78]|\uD835[\uDC00-\uDC54\uDC56-\uDC9C\uDC9E\uDC9F\uDCA2\uDCA5\uDCA6\uDCA9-\uDCAC\uDCAE-\uDCB9\uDCBB\uDCBD-\uDCC3\uDCC5-\uDD05\uDD07-\uDD0A\uDD0D-\uDD14\uDD16-\uDD1C\uDD1E-\uDD39\uDD3B-\uDD3E\uDD40-\uDD44\uDD46\uDD4A-\uDD50\uDD52-\uDEA5\uDEA8-\uDEC0\uDEC2-\uDEDA\uDEDC-\uDEFA\uDEFC-\uDF14\uDF16-\uDF34\uDF36-\uDF4E\uDF50-\uDF6E\uDF70-\uDF88\uDF8A-\uDFA8\uDFAA-\uDFC2\uDFC4-\uDFCB\uDFCE-\uDFFF]|\uD838[\uDD00-\uDD2C\uDD37-\uDD3D\uDD40-\uDD49\uDD4E\uDEC0-\uDEEB\uDEF0-\uDEF9]|\uD83A[\uDC00-\uDCC4\uDCC7-\uDCCF\uDD00-\uDD43\uDD4B\uDD50-\uDD59]|\uD83B[\uDC71-\uDCAB\uDCAD-\uDCAF\uDCB1-\uDCB4\uDD01-\uDD2D\uDD2F-\uDD3D\uDE00-\uDE03\uDE05-\uDE1F\uDE21\uDE22\uDE24\uDE27\uDE29-\uDE32\uDE34-\uDE37\uDE39\uDE3B\uDE42\uDE47\uDE49\uDE4B\uDE4D-\uDE4F\uDE51\uDE52\uDE54\uDE57\uDE59\uDE5B\uDE5D\uDE5F\uDE61\uDE62\uDE64\uDE67-\uDE6A\uDE6C-\uDE72\uDE74-\uDE77\uDE79-\uDE7C\uDE7E\uDE80-\uDE89\uDE8B-\uDE9B\uDEA1-\uDEA3\uDEA5-\uDEA9\uDEAB-\uDEBB]|\uD83C[\uDD00-\uDD0C]|\uD83E[\uDFF0-\uDFF9]|\uD869[\uDC00-\uDEDD\uDF00-\uDFFF]|\uD86D[\uDC00-\uDF34\uDF40-\uDFFF]|\uD86E[\uDC00-\uDC1D\uDC20-\uDFFF]|\uD873[\uDC00-\uDEA1\uDEB0-\uDFFF]|\uD87A[\uDC00-\uDFE0]|\uD87E[\uDC00-\uDE1D]|\uD884[\uDC00-\uDF4A])/)) return; // _ can't be between two alphanumerics. \p{L}\p{N} includes non-english alphabet/numbers as well
 
-      if (match && (!match[1] || match[1] && (prevChar === '' || this.rules.inline.punctuation.exec(prevChar)))) {
-        maskedSrc = maskedSrc.slice(-1 * src.length);
-        var endReg = match[0] === '**' ? this.rules.inline.strong.endAst : this.rules.inline.strong.endUnd;
+      var nextChar = match[1] || match[2] || '';
+
+      if (!nextChar || nextChar && (prevChar === '' || this.rules.inline.punctuation.exec(prevChar))) {
+        var lLength = match[0].length - 1;
+        var rDelim,
+            rLength,
+            delimTotal = lLength,
+            midDelimTotal = 0;
+        var endReg = match[0][0] === '*' ? this.rules.inline.emStrong.rDelimAst : this.rules.inline.emStrong.rDelimUnd;
         endReg.lastIndex = 0;
-        var cap;
+        maskedSrc = maskedSrc.slice(-1 * src.length + lLength); // Bump maskedSrc to same section of string as src (move to lexer?)
 
         while ((match = endReg.exec(maskedSrc)) != null) {
-          cap = this.rules.inline.strong.middle.exec(maskedSrc.slice(0, match.index + 3));
-
-          if (cap) {
-            return {
-              type: 'strong',
-              raw: src.slice(0, cap[0].length),
-              text: src.slice(2, cap[0].length - 2)
-            };
+          rDelim = match[1] || match[2] || match[3] || match[4] || match[5] || match[6];
+          if (!rDelim) continue; // matched the first alternative in rules.js (skip the * in __abc*abc__)
+
+          rLength = rDelim.length;
+
+          if (match[3] || match[4]) {
+            // found another Left Delim
+            delimTotal += rLength;
+            continue;
+          } else if (match[5] || match[6]) {
+            // either Left or Right Delim
+            if (lLength % 3 && !((lLength + rLength) % 3)) {
+              midDelimTotal += rLength;
+              continue; // CommonMark Emphasis Rules 9-10
+            }
           }
-        }
-      }
-    };
 
-    _proto.em = function em(src, maskedSrc, prevChar) {
-      if (prevChar === void 0) {
-        prevChar = '';
-      }
-
-      var match = this.rules.inline.em.start.exec(src);
-
-      if (match && (!match[1] || match[1] && (prevChar === '' || this.rules.inline.punctuation.exec(prevChar)))) {
-        maskedSrc = maskedSrc.slice(-1 * src.length);
-        var endReg = match[0] === '*' ? this.rules.inline.em.endAst : this.rules.inline.em.endUnd;
-        endReg.lastIndex = 0;
-        var cap;
+          delimTotal -= rLength;
+          if (delimTotal > 0) continue; // Haven't found enough closing delimiters
+          // If this is the last rDelimiter, remove extra characters. *a*** -> *a*
 
-        while ((match = endReg.exec(maskedSrc)) != null) {
-          cap = this.rules.inline.em.middle.exec(maskedSrc.slice(0, match.index + 2));
+          if (delimTotal + midDelimTotal - rLength <= 0 && !maskedSrc.slice(endReg.lastIndex).match(endReg)) {
+            rLength = Math.min(rLength, rLength + delimTotal + midDelimTotal);
+          }
 
-          if (cap) {
+          if (Math.min(lLength, rLength) % 2) {
             return {
               type: 'em',
-              raw: src.slice(0, cap[0].length),
-              text: src.slice(1, cap[0].length - 1)
+              raw: src.slice(0, lLength + match.index + rLength + 1),
+              text: src.slice(1, lLength + match.index + rLength)
+            };
+          }
+
+          if (Math.min(lLength, rLength) % 2 === 0) {
+            return {
+              type: 'strong',
+              raw: src.slice(0, lLength + match.index + rLength + 1),
+              text: src.slice(2, lLength + match.index + rLength - 1)
             };
           }
         }
@@ -1233,48 +1245,31 @@
     reflink: /^!?\[(label)\]\[(?!\s*\])((?:\\[\[\]]?|[^\[\]\\])+)\]/,
     nolink: /^!?\[(?!\s*\])((?:\[[^\[\]]*\]|\\[\[\]]|[^\[\]])*)\](?:\[\])?/,
     reflinkSearch: 'reflink|nolink(?!\\()',
-    strong: {
-      start: /^(?:(\*\*(?=[*punctuation]))|\*\*)(?![\s])|__/,
-      // (1) returns if starts w/ punctuation
-      middle: /^\*\*(?:(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)|\*(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)*?\*)+?\*\*$|^__(?![\s])((?:(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)|_(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)*?_)+?)__$/,
-      endAst: /[^punctuation\s]\*\*(?!\*)|[punctuation]\*\*(?!\*)(?:(?=[punctuation_\s]|$))/,
-      // last char can't be punct, or final * must also be followed by punct (or endline)
-      endUnd: /[^\s]__(?!_)(?:(?=[punctuation*\s])|$)/ // last char can't be a space, and final _ must preceed punct or \s (or endline)
-
-    },
-    em: {
-      start: /^(?:(\*(?=[punctuation]))|\*)(?![*\s])|_/,
-      // (1) returns if starts w/ punctuation
-      middle: /^\*(?:(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)|\*(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)*?\*)+?\*$|^_(?![_\s])(?:(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)|_(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)*?_)+?_$/,
-      endAst: /[^punctuation\s]\*(?!\*)|[punctuation]\*(?!\*)(?:(?=[punctuation_\s]|$))/,
-      // last char can't be punct, or final * must also be followed by punct (or endline)
-      endUnd: /[^\s]_(?!_)(?:(?=[punctuation*\s])|$)/ // last char can't be a space, and final _ must preceed punct or \s (or endline)
+    emStrong: {
+      lDelim: /^(?:\*+(?:([punct_])|[^\s*]))|^_+(?:([punct*])|([^\s_]))/,
+      //        (1) and (2) can only be a Right Delimiter. (3) and (4) can only be Left.  (5) and (6) can be either Left or Right.
+      //        () Skip other delimiter (1) #***                (2) a***#, a***                   (3) #***a, ***a                 (4) ***#              (5) #***#                 (6) a***a
+      rDelimAst: /\_\_[^_]*?\*[^_]*?\_\_|[punct_](\*+)(?=[\s]|$)|[^punct*_\s](\*+)(?=[punct_\s]|$)|[punct_\s](\*+)(?=[^punct*_\s])|[\s](\*+)(?=[punct_])|[punct_](\*+)(?=[punct_])|[^punct*_\s](\*+)(?=[^punct*_\s])/,
+      rDelimUnd: /\*\*[^*]*?\_[^*]*?\*\*|[punct*](\_+)(?=[\s]|$)|[^punct*_\s](\_+)(?=[punct*\s]|$)|[punct*\s](\_+)(?=[^punct*_\s])|[\s](\_+)(?=[punct*])|[punct*](\_+)(?=[punct*])/ // ^- Not allowed for _
 
     },
     code: /^(`+)([^`]|[^`][\s\S]*?[^`])\1(?!`)/,
     br: /^( {2,}|\\)\n(?!\s*$)/,
     del: noopTest$1,
-    text: /^(`+|[^`])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*]|\b_|$)|[^ ](?= {2,}\n)))/,
-    punctuation: /^([\s*punctuation])/
-  }; // list of punctuation marks from common mark spec
-  // without * and _ to workaround cases with double emphasis
+    text: /^(`+|[^`])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*_]|\b_|$)|[^ ](?= {2,}\n)))/,
+    punctuation: /^([\spunctuation])/
+  }; // list of punctuation marks from CommonMark spec
+  // without * and _ to handle the different emphasis markers * and _
 
   inline._punctuation = '!"#$%&\'()+\\-.,/:;<=>?@\\[\\]`^{|}~';
   inline.punctuation = edit$1(inline.punctuation).replace(/punctuation/g, inline._punctuation).getRegex(); // sequences em should skip over [title](link), `code`, <html>
 
-  inline._blockSkip = '\\[[^\\]]*?\\]\\([^\\)]*?\\)|`[^`]*?`|<[^>]*?>';
-  inline._overlapSkip = '__[^_]*?__|\\*\\*\\[^\\*\\]*?\\*\\*';
+  inline.blockSkip = /\[[^\]]*?\]\([^\)]*?\)|`[^`]*?`|<[^>]*?>/g;
+  inline.escapedEmSt = /\\\*|\\_/g;
   inline._comment = edit$1(block._comment).replace('(?:-->|$)', '-->').getRegex();
-  inline.em.start = edit$1(inline.em.start).replace(/punctuation/g, inline._punctuation).getRegex();
-  inline.em.middle = edit$1(inline.em.middle).replace(/punctuation/g, inline._punctuation).replace(/overlapSkip/g, inline._overlapSkip).getRegex();
-  inline.em.endAst = edit$1(inline.em.endAst, 'g').replace(/punctuation/g, inline._punctuation).getRegex();
-  inline.em.endUnd = edit$1(inline.em.endUnd, 'g').replace(/punctuation/g, inline._punctuation).getRegex();
-  inline.strong.start = edit$1(inline.strong.start).replace(/punctuation/g, inline._punctuation).getRegex();
-  inline.strong.middle = edit$1(inline.strong.middle).replace(/punctuation/g, inline._punctuation).replace(/overlapSkip/g, inline._overlapSkip).getRegex();
-  inline.strong.endAst = edit$1(inline.strong.endAst, 'g').replace(/punctuation/g, inline._punctuation).getRegex();
-  inline.strong.endUnd = edit$1(inline.strong.endUnd, 'g').replace(/punctuation/g, inline._punctuation).getRegex();
-  inline.blockSkip = edit$1(inline._blockSkip, 'g').getRegex();
-  inline.overlapSkip = edit$1(inline._overlapSkip, 'g').getRegex();
+  inline.emStrong.lDelim = edit$1(inline.emStrong.lDelim).replace(/punct/g, inline._punctuation).getRegex();
+  inline.emStrong.rDelimAst = edit$1(inline.emStrong.rDelimAst, 'g').replace(/punct/g, inline._punctuation).getRegex();
+  inline.emStrong.rDelimUnd = edit$1(inline.emStrong.rDelimUnd, 'g').replace(/punct/g, inline._punctuation).getRegex();
   inline._escapes = /\\([!"#$%&'()*+,\-./:;<=>?@\[\]\\^_`{|}~])/g;
   inline._scheme = /[a-zA-Z][a-zA-Z0-9+.-]{1,31}/;
   inline._email = /[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+(@)[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)+(?![-_])/;
@@ -1322,7 +1317,7 @@
     url: /^((?:ftp|https?):\/\/|www\.)(?:[a-zA-Z0-9\-]+\.?)+[^\s<]*|^email/,
     _backpedal: /(?:[^?!.,:;*_~()&]+|\([^)]*\)|&(?![a-zA-Z0-9]+;$)|[?!.,:;*_~)]+(?!$))+/,
     del: /^(~~?)(?=[^\s~])([\s\S]*?[^\s~])\1(?=[^~]|$)/,
-    text: /^([`~]+|[^`~])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*~]|\b_|https?:\/\/|ftp:\/\/|www\.|$)|[^ ](?= {2,}\n)|[^a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-](?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))|(?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))/
+    text: /^([`~]+|[^`~])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*~_]|\b_|https?:\/\/|ftp:\/\/|www\.|$)|[^ ](?= {2,}\n)|[^a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-](?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))|(?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))/
   });
   inline.gfm.url = edit$1(inline.gfm.url, 'i').replace('email', inline.gfm._extended_email).getRegex();
   /**
@@ -1721,6 +1716,11 @@
 
       while ((match = this.tokenizer.rules.inline.blockSkip.exec(maskedSrc)) != null) {
         maskedSrc = maskedSrc.slice(0, match.index) + '[' + repeatString$1('a', match[0].length - 2) + ']' + maskedSrc.slice(this.tokenizer.rules.inline.blockSkip.lastIndex);
+      } // Mask out escaped em & strong delimiters
+
+
+      while ((match = this.tokenizer.rules.inline.escapedEmSt.exec(maskedSrc)) != null) {
+        maskedSrc = maskedSrc.slice(0, match.index) + '++' + maskedSrc.slice(this.tokenizer.rules.inline.escapedEmSt.lastIndex);
       }
 
       while (src) {
@@ -1781,18 +1781,10 @@
           }
 
           continue;
-        } // strong
+        } // em & strong
 
 
-        if (token = this.tokenizer.strong(src, maskedSrc, prevChar)) {
-          src = src.substring(token.raw.length);
-          token.tokens = this.inlineTokens(token.text, [], inLink, inRawBlock);
-          tokens.push(token);
-          continue;
-        } // em
-
-
-        if (token = this.tokenizer.em(src, maskedSrc, prevChar)) {
+        if (token = this.tokenizer.emStrong(src, maskedSrc, prevChar)) {
           src = src.substring(token.raw.length);
           token.tokens = this.inlineTokens(token.text, [], inLink, inRawBlock);
           tokens.push(token);
@@ -1838,7 +1830,12 @@
 
         if (token = this.tokenizer.inlineText(src, inRawBlock, smartypants)) {
           src = src.substring(token.raw.length);
-          prevChar = token.raw.slice(-1);
+
+          if (token.raw.slice(-1) !== '_') {
+            // Track prevChar before string of ____ started
+            prevChar = token.raw.slice(-1);
+          }
+
           keepPrevChar = true;
           lastToken = tokens[tokens.length - 1];

marked.min.js+1 −1 modified

@@ -3,4 +3,4 @@
  * Copyright (c) 2011-2021, Christopher Jeffrey. (MIT Licensed)
  * https://github.com/markedjs/marked
  */
-!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e="undefined"!=typeof globalThis?globalThis:e||self).marked=t()}(this,function(){"use strict";function i(e,t){for(var n=0;n<t.length;n++){var r=t[n];r.enumerable=r.enumerable||!1,r.configurable=!0,"value"in r&&(r.writable=!0),Object.defineProperty(e,r.key,r)}}function s(e,t){(null==t||t>e.length)&&(t=e.length);for(var n=0,r=new Array(t);n<t;n++)r[n]=e[n];return r}function p(e,t){var n;if("undefined"!=typeof Symbol&&null!=e[Symbol.iterator])return(n=e[Symbol.iterator]()).next.bind(n);if(Array.isArray(e)||(n=function(e,t){if(e){if("string"==typeof e)return s(e,t);var n=Object.prototype.toString.call(e).slice(8,-1);return"Map"===(n="Object"===n&&e.constructor?e.constructor.name:n)||"Set"===n?Array.from(e):"Arguments"===n||/^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)?s(e,t):void 0}}(e))||t&&e&&"number"==typeof e.length){n&&(e=n);var r=0;return function(){return r>=e.length?{done:!0}:{done:!1,value:e[r++]}}}throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.")}function n(e){return c[e]}var e,t=(function(t){function e(){return{baseUrl:null,breaks:!1,gfm:!0,headerIds:!0,headerPrefix:"",highlight:null,langPrefix:"language-",mangle:!0,pedantic:!1,renderer:null,sanitize:!1,sanitizer:null,silent:!1,smartLists:!1,smartypants:!1,tokenizer:null,walkTokens:null,xhtml:!1}}t.exports={defaults:e(),getDefaults:e,changeDefaults:function(e){t.exports.defaults=e}}}(e={exports:{}}),e.exports),r=/[&<>"']/,l=/[&<>"']/g,a=/[<>"']|&(?!#?\w+;)/,o=/[<>"']|&(?!#?\w+;)/g,c={"&":"&amp;","<":"&lt;",">":"&gt;",'"':"&quot;","'":"&#39;"};var u=/&(#(?:\d+)|(?:#x[0-9A-Fa-f]+)|(?:\w+));?/gi;function h(e){return e.replace(u,function(e,t){return"colon"===(t=t.toLowerCase())?":":"#"===t.charAt(0)?"x"===t.charAt(1)?String.fromCharCode(parseInt(t.substring(2),16)):String.fromCharCode(+t.substring(1)):""})}var g=/(^|[^\[])\^/g;var f=/[^\w:]/g,d=/^$|^[a-z][a-z0-9+.-]*:|^[?#]/i;var k={},b=/^[^:]+:\/*[^/]*$/,m=/^([^:]+:)[\s\S]*$/,x=/^([^:]+:\/*[^/]*)[\s\S]*$/;function w(e,t){k[" "+e]||(b.test(e)?k[" "+e]=e+"/":k[" "+e]=v(e,"/",!0));var n=-1===(e=k[" "+e]).indexOf(":");return"//"===t.substring(0,2)?n?t:e.replace(m,"$1")+t:"/"===t.charAt(0)?n?t:e.replace(x,"$1")+t:e+t}function v(e,t,n){var r=e.length;if(0===r)return"";for(var i=0;i<r;){var s=e.charAt(r-i-1);if(s!==t||n){if(s===t||!n)break;i++}else i++}return e.substr(0,r-i)}var _=function(e,t){if(t){if(r.test(e))return e.replace(l,n)}else if(a.test(e))return e.replace(o,n);return e},y=h,z=function(n,e){n=n.source||n,e=e||"";var r={replace:function(e,t){return t=(t=t.source||t).replace(g,"$1"),n=n.replace(e,t),r},getRegex:function(){return new RegExp(n,e)}};return r},$=function(e,t,n){if(e){var r;try{r=decodeURIComponent(h(n)).replace(f,"").toLowerCase()}catch(e){return null}if(0===r.indexOf("javascript:")||0===r.indexOf("vbscript:")||0===r.indexOf("data:"))return null}t&&!d.test(n)&&(n=w(t,n));try{n=encodeURI(n).replace(/%25/g,"%")}catch(e){return null}return n},S={exec:function(){}},A=function(e){for(var t,n,r=1;r<arguments.length;r++)for(n in t=arguments[r])Object.prototype.hasOwnProperty.call(t,n)&&(e[n]=t[n]);return e},R=function(e,t){var n=e.replace(/\|/g,function(e,t,n){for(var r=!1,i=t;0<=--i&&"\\"===n[i];)r=!r;return r?"|":" |"}).split(/ \|/),r=0;if(n.length>t)n.splice(t);else for(;n.length<t;)n.push("");for(;r<n.length;r++)n[r]=n[r].trim().replace(/\\\|/g,"|");return n},T=function(e,t){if(-1===e.indexOf(t[1]))return-1;for(var n=e.length,r=0,i=0;i<n;i++)if("\\"===e[i])i++;else if(e[i]===t[0])r++;else if(e[i]===t[1]&&--r<0)return i;return-1},I=function(e){e&&e.sanitize&&!e.silent&&console.warn("marked(): sanitize and sanitizer parameters are deprecated since version 0.7.0, should not be used and will be removed in the future. 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n=e[1];return t.split("\n").map(function(e){var t=e.match(/^\s+/);return null!==t&&t[0].length>=n.length?e.slice(n.length):e}).join("\n")}(n,t[3]||"");return{type:"code",raw:n,lang:t[2]&&t[2].trim(),text:e}}},t.heading=function(e){var t=this.rules.block.heading.exec(e);if(t){var n=t[2].trim();return/#$/.test(n)&&(e=O(n,"#"),!this.options.pedantic&&e&&!/ $/.test(e)||(n=e.trim())),{type:"heading",raw:t[0],depth:t[1].length,text:n}}},t.nptable=function(e){e=this.rules.block.nptable.exec(e);if(e){var t={type:"table",header:C(e[1].replace(/^ *| *\| *$/g,"")),align:e[2].replace(/^ *|\| *$/g,"").split(/ *\| */),cells:e[3]?e[3].replace(/\n$/,"").split("\n"):[],raw:e[0]};if(t.header.length===t.align.length){for(var n=t.align.length,r=0;r<n;r++)/^ *-+: *$/.test(t.align[r])?t.align[r]="right":/^ *:-+: *$/.test(t.align[r])?t.align[r]="center":/^ *:-+ *$/.test(t.align[r])?t.align[r]="left":t.align[r]=null;for(n=t.cells.length,r=0;r<n;r++)t.cells[r]=C(t.cells[r],t.header.length);return t}}},t.hr=function(e){e=this.rules.block.hr.exec(e);if(e)return{type:"hr",raw:e[0]}},t.blockquote=function(e){var t=this.rules.block.blockquote.exec(e);if(t){e=t[0].replace(/^ *> ?/gm,"");return{type:"blockquote",raw:t[0],text:e}}},t.list=function(e){e=this.rules.block.list.exec(e);if(e){for(var t,n,r,i,s,l=e[0],a=e[2],o=1<a.length,c={type:"list",raw:l,ordered:o,start:o?+a.slice(0,-1):"",loose:!1,items:[]},u=e[0].match(this.rules.block.item),p=!1,h=u.length,g=this.rules.block.listItemStart.exec(u[0]),f=0;f<h;f++){if(l=t=u[f],f!==h-1){if(r=this.rules.block.listItemStart.exec(u[f+1]),this.options.pedantic?r[1].length>g[1].length:r[1].length>g[0].length||3<r[1].length){u.splice(f,2,u[f]+"\n"+u[f+1]),f--,h--;continue}(!this.options.pedantic||this.options.smartLists?r[2][r[2].length-1]!==a[a.length-1]:o==(1===r[2].length))&&(n=u.slice(f+1).join("\n"),c.raw=c.raw.substring(0,c.raw.length-n.length),f=h-1),g=r}r=t.length,~(t=t.replace(/^ *([*+-]|\d+[.)]) ?/,"")).indexOf("\n 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r=n[1]||n[2]||"";if(!r||r&&(""===t||this.rules.inline.punctuation.exec(t))){var i,s=n[0].length-1,l=s,a=0,D="*"===n[0][0]?this.rules.inline.emStrong.rDelimAst:this.rules.inline.emStrong.rDelimUnd;for(D.lastIndex=0,u=u.slice(-1*e.length+s);null!=(n=D.exec(u));)if(i=n[1]||n[2]||n[3]||n[4]||n[5]||n[6])if(i=i.length,n[3]||n[4])l+=i;else if(!((n[5]||n[6])&&s%3)||(s+i)%3){if(!(0<(l-=i))){if(l+a-i<=0&&!u.slice(D.lastIndex).match(D)&&(i=Math.min(i,i+l+a)),Math.min(s,i)%2)return{type:"em",raw:e.slice(0,s+n.index+i+1),text:e.slice(1,s+n.index+i)};if(Math.min(s,i)%2==0)return{type:"strong",raw:e.slice(0,s+n.index+i+1),text:e.slice(2,s+n.index+i-1)}}}else a+=i}}},u.codespan=function(e){var u=this.rules.inline.code.exec(e);if(u){var t=u[2].replace(/\n/g," "),n=/[^ ]/.test(t),e=/^ /.test(t)&&/ $/.test(t);return n&&e&&(t=t.substring(1,t.length-1)),t=R(t,!0),{type:"codespan",raw:u[0],text:t}}},u.br=function(e){e=this.rules.inline.br.exec(e);if(e)return{type:"br",raw:e[0]}},u.del=function(e){e=this.rules.inline.del.exec(e);if(e)return{type:"del",raw:e[0],text:e[2]}},u.autolink=function(e,u){e=this.rules.inline.autolink.exec(e);if(e){var t,u="@"===e[2]?"mailto:"+(t=R(this.options.mangle?u(e[1]):e[1])):t=R(e[1]);return{type:"link",raw:e[0],text:t,href:u,tokens:[{type:"text",raw:t,text:t}]}}},u.url=function(e,u){var t,n,r,i;if(t=this.rules.inline.url.exec(e)){if("@"===t[2])r="mailto:"+(n=R(this.options.mangle?u(t[0]):t[0]));else{for(;i=t[0],t[0]=this.rules.inline._backpedal.exec(t[0])[0],i!==t[0];);n=R(t[0]),r="www."===t[1]?"http://"+n:n}return{type:"link",raw:t[0],text:n,href:r,tokens:[{type:"text",raw:n,text:n}]}}},u.inlineText=function(e,u,t){e=this.rules.inline.text.exec(e);if(e){t=u?this.options.sanitize?this.options.sanitizer?this.options.sanitizer(e[0]):R(e[0]):e[0]:R(this.options.smartypants?t(e[0]):e[0]);return{type:"text",raw:e[0],text:t}}},e}(),y=w,_=x,w=v,x={newline:/^(?: *(?:\n|$))+/,code:/^( {4}[^\n]+(?:\n(?: *(?:\n|$))*)?)+/,fences:/^ {0,3}(`{3,}(?=[^`\n]*\n)|~{3,})([^\n]*)\n(?:|([\s\S]*?)\n)(?: {0,3}\1[~`]* *(?:\n+|$)|$)/,hr:/^ {0,3}((?:- *){3,}|(?:_ *){3,}|(?:\* *){3,})(?:\n+|$)/,heading:/^ {0,3}(#{1,6})(?=\s|$)(.*)(?:\n+|$)/,blockquote:/^( {0,3}> ?(paragraph|[^\n]*)(?:\n|$))+/,list:/^( {0,3})(bull) [\s\S]+?(?:hr|def|\n{2,}(?! )(?! {0,3}bull )\n*|\s*$)/,html:"^ {0,3}(?:<(script|pre|style)[\\s>][\\s\\S]*?(?:</\\1>[^\\n]*\\n+|$)|comment[^\\n]*(\\n+|$)|<\\?[\\s\\S]*?(?:\\?>\\n*|$)|<![A-Z][\\s\\S]*?(?:>\\n*|$)|<!\\[CDATA\\[[\\s\\S]*?(?:\\]\\]>\\n*|$)|</?(tag)(?: +|\\n|/?>)[\\s\\S]*?(?:\\n{2,}|$)|<(?!script|pre|style)([a-z][\\w-]*)(?:attribute)*? */?>(?=[ \\t]*(?:\\n|$))[\\s\\S]*?(?:\\n{2,}|$)|</(?!script|pre|style)[a-z][\\w-]*\\s*>(?=[ \\t]*(?:\\n|$))[\\s\\S]*?(?:\\n{2,}|$))",def:/^ {0,3}\[(label)\]: *\n? *<?([^\s>]+)>?(?:(?: +\n? *| *\n *)(title))? *(?:\n+|$)/,nptable:y,table:y,lheading:/^([^\n]+)\n {0,3}(=+|-+) *(?:\n+|$)/,_paragraph:/^([^\n]+(?:\n(?!hr|heading|lheading|blockquote|fences|list|html| +\n)[^\n]+)*)/,text:/^[^\n]+/,_label:/(?!\s*\])(?:\\[\[\]]|[^\[\]])+/,_title:/(?:"(?:\\"?|[^"\\])*"|'[^'\n]*(?:\n[^'\n]+)*\n?'|\([^()]*\))/};x.def=_(x.def).replace("label",x._label).replace("title",x._title).getRegex(),x.bullet=/(?:[*+-]|\d{1,9}[.)])/,x.item=/^( *)(bull) ?[^\n]*(?:\n(?! *bull ?)[^\n]*)*/,x.item=_(x.item,"gm").replace(/bull/g,x.bullet).getRegex(),x.listItemStart=_(/^( *)(bull)/).replace("bull",x.bullet).getRegex(),x.list=_(x.list).replace(/bull/g,x.bullet).replace("hr","\\n+(?=\\1?(?:(?:- *){3,}|(?:_ *){3,}|(?:\\* *){3,})(?:\\n+|$))").replace("def","\\n+(?="+x.def.source+")").getRegex(),x._tag="address|article|aside|base|basefont|blockquote|body|caption|center|col|colgroup|dd|details|dialog|dir|div|dl|dt|fieldset|figcaption|figure|footer|form|frame|frameset|h[1-6]|head|header|hr|html|iframe|legend|li|link|main|menu|menuitem|meta|nav|noframes|ol|optgroup|option|p|param|section|source|summary|table|tbody|td|tfoot|th|thead|title|tr|track|ul",x._comment=/<!--(?!-?>)[\s\S]*?(?:-->|$)/,x.html=_(x.html,"i").replace("comment",x._comment).replace("tag",x._tag).replace("attribute",/ +[a-zA-Z:_][\w.:-]*(?: *= *"[^"\n]*"| *= *'[^'\n]*'| *= *[^\s"'=<>`]+)?/).getRegex(),x.paragraph=_(x._paragraph).replace("hr",x.hr).replace("heading"," {0,3}#{1,6} ").replace("|lheading","").replace("blockquote"," {0,3}>").replace("fences"," {0,3}(?:`{3,}(?=[^`\\n]*\\n)|~{3,})[^\\n]*\\n").replace("list"," {0,3}(?:[*+-]|1[.)]) ").replace("html","</?(?:tag)(?: +|\\n|/?>)|<(?:script|pre|style|!--)").replace("tag",x._tag).getRegex(),x.blockquote=_(x.blockquote).replace("paragraph",x.paragraph).getRegex(),x.normal=w({},x),x.gfm=w({},x.normal,{nptable:"^ *([^|\\n ].*\\|.*)\\n {0,3}([-:]+ *\\|[-| :]*)(?:\\n((?:(?!\\n|hr|heading|blockquote|code|fences|list|html).*(?:\\n|$))*)\\n*|$)",table:"^ *\\|(.+)\\n {0,3}\\|?( *[-:]+[-| :]*)(?:\\n *((?:(?!\\n|hr|heading|blockquote|code|fences|list|html).*(?:\\n|$))*)\\n*|$)"}),x.gfm.nptable=_(x.gfm.nptable).replace("hr",x.hr).replace("heading"," {0,3}#{1,6} ").replace("blockquote"," {0,3}>").replace("code"," {4}[^\\n]").replace("fences"," {0,3}(?:`{3,}(?=[^`\\n]*\\n)|~{3,})[^\\n]*\\n").replace("list"," {0,3}(?:[*+-]|1[.)]) ").replace("html","</?(?:tag)(?: +|\\n|/?>)|<(?:script|pre|style|!--)").replace("tag",x._tag).getRegex(),x.gfm.table=_(x.gfm.table).replace("hr",x.hr).replace("heading"," {0,3}#{1,6} ").replace("blockquote"," {0,3}>").replace("code"," {4}[^\\n]").replace("fences"," {0,3}(?:`{3,}(?=[^`\\n]*\\n)|~{3,})[^\\n]*\\n").replace("list"," {0,3}(?:[*+-]|1[.)]) ").replace("html","</?(?:tag)(?: +|\\n|/?>)|<(?:script|pre|style|!--)").replace("tag",x._tag).getRegex(),x.pedantic=w({},x.normal,{html:_("^ *(?:comment *(?:\\n|\\s*$)|<(tag)[\\s\\S]+?</\\1> *(?:\\n{2,}|\\s*$)|<tag(?:\"[^\"]*\"|'[^']*'|\\s[^'\"/>\\s]*)*?/?> *(?:\\n{2,}|\\s*$))").replace("comment",x._comment).replace(/tag/g,"(?!(?:a|em|strong|small|s|cite|q|dfn|abbr|data|time|code|var|samp|kbd|sub|sup|i|b|u|mark|ruby|rt|rp|bdi|bdo|span|br|wbr|ins|del|img)\\b)\\w+(?!:|[^\\w\\s@]*@)\\b").getRegex(),def:/^ *\[([^\]]+)\]: *<?([^\s>]+)>?(?: +(["(][^\n]+[")]))? *(?:\n+|$)/,heading:/^(#{1,6})(.*)(?:\n+|$)/,fences:y,paragraph:_(x.normal._paragraph).replace("hr",x.hr).replace("heading"," *#{1,6} *[^\n]").replace("lheading",x.lheading).replace("blockquote"," {0,3}>").replace("|fences","").replace("|list","").replace("|html","").getRegex()});y={escape:/^\\([!"#$%&'()*+,\-./:;<=>?@\[\]\\^_`{|}~])/,autolink:/^<(scheme:[^\s\x00-\x1f<>]*|email)>/,url:y,tag:"^comment|^</[a-zA-Z][\\w:-]*\\s*>|^<[a-zA-Z][\\w-]*(?:attribute)*?\\s*/?>|^<\\?[\\s\\S]*?\\?>|^<![a-zA-Z]+\\s[\\s\\S]*?>|^<!\\[CDATA\\[[\\s\\S]*?\\]\\]>",link:/^!?\[(label)\]\(\s*(href)(?:\s+(title))?\s*\)/,reflink:/^!?\[(label)\]\[(?!\s*\])((?:\\[\[\]]?|[^\[\]\\])+)\]/,nolink:/^!?\[(?!\s*\])((?:\[[^\[\]]*\]|\\[\[\]]|[^\[\]])*)\](?:\[\])?/,reflinkSearch:"reflink|nolink(?!\\()",emStrong:{lDelim:/^(?:\*+(?:([punct_])|[^\s*]))|^_+(?:([punct*])|([^\s_]))/,rDelimAst:/\_\_[^_]*?\*[^_]*?\_\_|[punct_](\*+)(?=[\s]|$)|[^punct*_\s](\*+)(?=[punct_\s]|$)|[punct_\s](\*+)(?=[^punct*_\s])|[\s](\*+)(?=[punct_])|[punct_](\*+)(?=[punct_])|[^punct*_\s](\*+)(?=[^punct*_\s])/,rDelimUnd:/\*\*[^*]*?\_[^*]*?\*\*|[punct*](\_+)(?=[\s]|$)|[^punct*_\s](\_+)(?=[punct*\s]|$)|[punct*\s](\_+)(?=[^punct*_\s])|[\s](\_+)(?=[punct*])|[punct*](\_+)(?=[punct*])/},code:/^(`+)([^`]|[^`][\s\S]*?[^`])\1(?!`)/,br:/^( {2,}|\\)\n(?!\s*$)/,del:y,text:/^(`+|[^`])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*_]|\b_|$)|[^ ](?= {2,}\n)))/,punctuation:/^([\spunctuation])/,_punctuation:"!\"#$%&'()+\\-.,/:;<=>?@\\[\\]`^{|}~"};y.punctuation=_(y.punctuation).replace(/punctuation/g,y._punctuation).getRegex(),y.blockSkip=/\[[^\]]*?\]\([^\)]*?\)|`[^`]*?`|<[^>]*?>/g,y.escapedEmSt=/\\\*|\\_/g,y._comment=_(x._comment).replace("(?:--\x3e|$)","--\x3e").getRegex(),y.emStrong.lDelim=_(y.emStrong.lDelim).replace(/punct/g,y._punctuation).getRegex(),y.emStrong.rDelimAst=_(y.emStrong.rDelimAst,"g").replace(/punct/g,y._punctuation).getRegex(),y.emStrong.rDelimUnd=_(y.emStrong.rDelimUnd,"g").replace(/punct/g,y._punctuation).getRegex(),y._escapes=/\\([!"#$%&'()*+,\-./:;<=>?@\[\]\\^_`{|}~])/g,y._scheme=/[a-zA-Z][a-zA-Z0-9+.-]{1,31}/,y._email=/[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+(@)[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)+(?![-_])/,y.autolink=_(y.autolink).replace("scheme",y._scheme).replace("email",y._email).getRegex(),y._attribute=/\s+[a-zA-Z:_][\w.:-]*(?:\s*=\s*"[^"]*"|\s*=\s*'[^']*'|\s*=\s*[^\s"'=<>`]+)?/,y.tag=_(y.tag).replace("comment",y._comment).replace("attribute",y._attribute).getRegex(),y._label=/(?:\[(?:\\.|[^\[\]\\])*\]|\\.|`[^`]*`|[^\[\]\\`])*?/,y._href=/<(?:\\.|[^\n<>\\])+>|[^\s\x00-\x1f]*/,y._title=/"(?:\\"?|[^"\\])*"|'(?:\\'?|[^'\\])*'|\((?:\\\)?|[^)\\])*\)/,y.link=_(y.link).replace("label",y._label).replace("href",y._href).replace("title",y._title).getRegex(),y.reflink=_(y.reflink).replace("label",y._label).getRegex(),y.reflinkSearch=_(y.reflinkSearch,"g").replace("reflink",y.reflink).replace("nolink",y.nolink).getRegex(),y.normal=w({},y),y.pedantic=w({},y.normal,{strong:{start:/^__|\*\*/,middle:/^__(?=\S)([\s\S]*?\S)__(?!_)|^\*\*(?=\S)([\s\S]*?\S)\*\*(?!\*)/,endAst:/\*\*(?!\*)/g,endUnd:/__(?!_)/g},em:{start:/^_|\*/,middle:/^()\*(?=\S)([\s\S]*?\S)\*(?!\*)|^_(?=\S)([\s\S]*?\S)_(?!_)/,endAst:/\*(?!\*)/g,endUnd:/_(?!_)/g},link:_(/^!?\[(label)\]\((.*?)\)/).replace("label",y._label).getRegex(),reflink:_(/^!?\[(label)\]\s*\[([^\]]*)\]/).replace("label",y._label).getRegex()}),y.gfm=w({},y.normal,{escape:_(y.escape).replace("])","~|])").getRegex(),_extended_email:/[A-Za-z0-9._+-]+(@)[a-zA-Z0-9-_]+(?:\.[a-zA-Z0-9-_]*[a-zA-Z0-9])+(?![-_])/,url:/^((?:ftp|https?):\/\/|www\.)(?:[a-zA-Z0-9\-]+\.?)+[^\s<]*|^email/,_backpedal:/(?:[^?!.,:;*_~()&]+|\([^)]*\)|&(?![a-zA-Z0-9]+;$)|[?!.,:;*_~)]+(?!$))+/,del:/^(~~?)(?=[^\s~])([\s\S]*?[^\s~])\1(?=[^~]|$)/,text:/^([`~]+|[^`~])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*~_]|\b_|https?:\/\/|ftp:\/\/|www\.|$)|[^ ](?= {2,}\n)|[^a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-](?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))|(?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))/}),y.gfm.url=_(y.gfm.url,"i").replace("email",y.gfm._extended_email).getRegex(),y.breaks=w({},y.gfm,{br:_(y.br).replace("{2,}","*").getRegex(),text:_(y.gfm.text).replace("\\b_","\\b_| {2,}\\n").replace(/\{2,\}/g,"*").getRegex()});var y={block:x,inline:y},j=u.defaults,U=y.block,P=y.inline,L=$;function M(e){return e.replace(/---/g,"—").replace(/--/g
... [truncated]

src/Lexer.js+11 −11 modified

@@ -355,11 +355,17 @@ module.exports = class Lexer {
       maskedSrc = maskedSrc.slice(0, match.index) + '[' + repeatString('a', match[0].length - 2) + ']' + maskedSrc.slice(this.tokenizer.rules.inline.blockSkip.lastIndex);
     }
 
+    // Mask out escaped em & strong delimiters
+    while ((match = this.tokenizer.rules.inline.escapedEmSt.exec(maskedSrc)) != null) {
+      maskedSrc = maskedSrc.slice(0, match.index) + '++' + maskedSrc.slice(this.tokenizer.rules.inline.escapedEmSt.lastIndex);
+    }
+
     while (src) {
       if (!keepPrevChar) {
         prevChar = '';
       }
       keepPrevChar = false;
+
       // escape
       if (token = this.tokenizer.escape(src)) {
         src = src.substring(token.raw.length);
@@ -408,16 +414,8 @@ module.exports = class Lexer {
         continue;
       }
 
-      // strong
-      if (token = this.tokenizer.strong(src, maskedSrc, prevChar)) {
-        src = src.substring(token.raw.length);
-        token.tokens = this.inlineTokens(token.text, [], inLink, inRawBlock);
-        tokens.push(token);
-        continue;
-      }
-
-      // em
-      if (token = this.tokenizer.em(src, maskedSrc, prevChar)) {
+      // em & strong
+      if (token = this.tokenizer.emStrong(src, maskedSrc, prevChar)) {
         src = src.substring(token.raw.length);
         token.tokens = this.inlineTokens(token.text, [], inLink, inRawBlock);
         tokens.push(token);
@@ -463,7 +461,9 @@ module.exports = class Lexer {
       // text
       if (token = this.tokenizer.inlineText(src, inRawBlock, smartypants)) {
         src = src.substring(token.raw.length);
-        prevChar = token.raw.slice(-1);
+        if (token.raw.slice(-1) !== '_') { // Track prevChar before string of ____ started
+          prevChar = token.raw.slice(-1);
+        }
         keepPrevChar = true;
         lastToken = tokens[tokens.length - 1];
         if (lastToken && lastToken.type === 'text') {

src/rules.js+19 −52 modified

@@ -173,74 +173,41 @@ const inline = {
   reflink: /^!?\[(label)\]\[(?!\s*\])((?:\\[\[\]]?|[^\[\]\\])+)\]/,
   nolink: /^!?\[(?!\s*\])((?:\[[^\[\]]*\]|\\[\[\]]|[^\[\]])*)\](?:\[\])?/,
   reflinkSearch: 'reflink|nolink(?!\\()',
-  strong: {
-    start: /^(?:(\*\*(?=[*punctuation]))|\*\*)(?![\s])|__/, // (1) returns if starts w/ punctuation
-    middle: /^\*\*(?:(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)|\*(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)*?\*)+?\*\*$|^__(?![\s])((?:(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)|_(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)*?_)+?)__$/,
-    endAst: /[^punctuation\s]\*\*(?!\*)|[punctuation]\*\*(?!\*)(?:(?=[punctuation_\s]|$))/, // last char can't be punct, or final * must also be followed by punct (or endline)
-    endUnd: /[^\s]__(?!_)(?:(?=[punctuation*\s])|$)/ // last char can't be a space, and final _ must preceed punct or \s (or endline)
-  },
-  em: {
-    start: /^(?:(\*(?=[punctuation]))|\*)(?![*\s])|_/, // (1) returns if starts w/ punctuation
-    middle: /^\*(?:(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)|\*(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)*?\*)+?\*$|^_(?![_\s])(?:(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)|_(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)*?_)+?_$/,
-    endAst: /[^punctuation\s]\*(?!\*)|[punctuation]\*(?!\*)(?:(?=[punctuation_\s]|$))/, // last char can't be punct, or final * must also be followed by punct (or endline)
-    endUnd: /[^\s]_(?!_)(?:(?=[punctuation*\s])|$)/ // last char can't be a space, and final _ must preceed punct or \s (or endline)
+  emStrong: {
+    lDelim: /^(?:\*+(?:([punct_])|[^\s*]))|^_+(?:([punct*])|([^\s_]))/,
+    //        (1) and (2) can only be a Right Delimiter. (3) and (4) can only be Left.  (5) and (6) can be either Left or Right.
+    //        () Skip other delimiter (1) #***                (2) a***#, a***                   (3) #***a, ***a                 (4) ***#              (5) #***#                 (6) a***a
+    rDelimAst: /\_\_[^_]*?\*[^_]*?\_\_|[punct_](\*+)(?=[\s]|$)|[^punct*_\s](\*+)(?=[punct_\s]|$)|[punct_\s](\*+)(?=[^punct*_\s])|[\s](\*+)(?=[punct_])|[punct_](\*+)(?=[punct_])|[^punct*_\s](\*+)(?=[^punct*_\s])/,
+    rDelimUnd: /\*\*[^*]*?\_[^*]*?\*\*|[punct*](\_+)(?=[\s]|$)|[^punct*_\s](\_+)(?=[punct*\s]|$)|[punct*\s](\_+)(?=[^punct*_\s])|[\s](\_+)(?=[punct*])|[punct*](\_+)(?=[punct*])/ // ^- Not allowed for _
   },
   code: /^(`+)([^`]|[^`][\s\S]*?[^`])\1(?!`)/,
   br: /^( {2,}|\\)\n(?!\s*$)/,
   del: noopTest,
-  text: /^(`+|[^`])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*]|\b_|$)|[^ ](?= {2,}\n)))/,
-  punctuation: /^([\s*punctuation])/
+  text: /^(`+|[^`])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*_]|\b_|$)|[^ ](?= {2,}\n)))/,
+  punctuation: /^([\spunctuation])/
 };
 
-// list of punctuation marks from common mark spec
-// without * and _ to workaround cases with double emphasis
+// list of punctuation marks from CommonMark spec
+// without * and _ to handle the different emphasis markers * and _
 inline._punctuation = '!"#$%&\'()+\\-.,/:;<=>?@\\[\\]`^{|}~';
 inline.punctuation = edit(inline.punctuation).replace(/punctuation/g, inline._punctuation).getRegex();
 
 // sequences em should skip over [title](link), `code`, <html>
-inline._blockSkip = '\\[[^\\]]*?\\]\\([^\\)]*?\\)|`[^`]*?`|<[^>]*?>';
-inline._overlapSkip = '__[^_]*?__|\\*\\*\\[^\\*\\]*?\\*\\*';
+inline.blockSkip = /\[[^\]]*?\]\([^\)]*?\)|`[^`]*?`|<[^>]*?>/g;
+inline.escapedEmSt = /\\\*|\\_/g;
 
 inline._comment = edit(block._comment).replace('(?:-->|$)', '-->').getRegex();
 
-inline.em.start = edit(inline.em.start)
-  .replace(/punctuation/g, inline._punctuation)
-  .getRegex();
-
-inline.em.middle = edit(inline.em.middle)
-  .replace(/punctuation/g, inline._punctuation)
-  .replace(/overlapSkip/g, inline._overlapSkip)
-  .getRegex();
-
-inline.em.endAst = edit(inline.em.endAst, 'g')
-  .replace(/punctuation/g, inline._punctuation)
-  .getRegex();
-
-inline.em.endUnd = edit(inline.em.endUnd, 'g')
-  .replace(/punctuation/g, inline._punctuation)
-  .getRegex();
-
-inline.strong.start = edit(inline.strong.start)
-  .replace(/punctuation/g, inline._punctuation)
-  .getRegex();
-
-inline.strong.middle = edit(inline.strong.middle)
-  .replace(/punctuation/g, inline._punctuation)
-  .replace(/overlapSkip/g, inline._overlapSkip)
-  .getRegex();
-
-inline.strong.endAst = edit(inline.strong.endAst, 'g')
-  .replace(/punctuation/g, inline._punctuation)
-  .getRegex();
-
-inline.strong.endUnd = edit(inline.strong.endUnd, 'g')
-  .replace(/punctuation/g, inline._punctuation)
+inline.emStrong.lDelim = edit(inline.emStrong.lDelim)
+  .replace(/punct/g, inline._punctuation)
   .getRegex();
 
-inline.blockSkip = edit(inline._blockSkip, 'g')
+inline.emStrong.rDelimAst = edit(inline.emStrong.rDelimAst, 'g')
+  .replace(/punct/g, inline._punctuation)
   .getRegex();
 
-inline.overlapSkip = edit(inline._overlapSkip, 'g')
+inline.emStrong.rDelimUnd = edit(inline.emStrong.rDelimUnd, 'g')
+  .replace(/punct/g, inline._punctuation)
   .getRegex();
 
 inline._escapes = /\\([!"#$%&'()*+,\-./:;<=>?@\[\]\\^_`{|}~])/g;
@@ -319,7 +286,7 @@ inline.gfm = merge({}, inline.normal, {
   url: /^((?:ftp|https?):\/\/|www\.)(?:[a-zA-Z0-9\-]+\.?)+[^\s<]*|^email/,
   _backpedal: /(?:[^?!.,:;*_~()&]+|\([^)]*\)|&(?![a-zA-Z0-9]+;$)|[?!.,:;*_~)]+(?!$))+/,
   del: /^(~~?)(?=[^\s~])([\s\S]*?[^\s~])\1(?=[^~]|$)/,
-  text: /^([`~]+|[^`~])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*~]|\b_|https?:\/\/|ftp:\/\/|www\.|$)|[^ ](?= {2,}\n)|[^a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-](?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))|(?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))/
+  text: /^([`~]+|[^`~])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*~_]|\b_|https?:\/\/|ftp:\/\/|www\.|$)|[^ ](?= {2,}\n)|[^a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-](?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))|(?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))/
 });
 
 inline.gfm.url = edit(inline.gfm.url, 'i')

src/Tokenizer.js+43 −28 modified

@@ -527,46 +527,61 @@ module.exports = class Tokenizer {
     }
   }
 
-  strong(src, maskedSrc, prevChar = '') {
-    let match = this.rules.inline.strong.start.exec(src);
+  emStrong(src, maskedSrc, prevChar = '') {
+    let match = this.rules.inline.emStrong.lDelim.exec(src);
+    if (!match) return;
 
-    if (match && (!match[1] || (match[1] && (prevChar === '' || this.rules.inline.punctuation.exec(prevChar))))) {
-      maskedSrc = maskedSrc.slice(-1 * src.length);
-      const endReg = match[0] === '**' ? this.rules.inline.strong.endAst : this.rules.inline.strong.endUnd;
+    if (match[3] && prevChar.match(/[\p{L}\p{N}]/u)) return; // _ can't be between two alphanumerics. \p{L}\p{N} includes non-english alphabet/numbers as well
 
+    const nextChar = match[1] || match[2] || '';
+
+    if (!nextChar || (nextChar && (prevChar === '' || this.rules.inline.punctuation.exec(prevChar)))) {
+      const lLength = match[0].length - 1;
+      let rDelim, rLength, delimTotal = lLength, midDelimTotal = 0;
+
+      const endReg = match[0][0] === '*' ? this.rules.inline.emStrong.rDelimAst : this.rules.inline.emStrong.rDelimUnd;
       endReg.lastIndex = 0;
 
-      let cap;
+      maskedSrc = maskedSrc.slice(-1 * src.length + lLength); // Bump maskedSrc to same section of string as src (move to lexer?)
+
       while ((match = endReg.exec(maskedSrc)) != null) {
-        cap = this.rules.inline.strong.middle.exec(maskedSrc.slice(0, match.index + 3));
-        if (cap) {
-          return {
-            type: 'strong',
-            raw: src.slice(0, cap[0].length),
-            text: src.slice(2, cap[0].length - 2)
-          };
+        rDelim = match[1] || match[2] || match[3] || match[4] || match[5] || match[6];
+
+        if (!rDelim) continue; // matched the first alternative in rules.js (skip the * in __abc*abc__)
+
+        rLength = rDelim.length;
+
+        if (match[3] || match[4]) { // found another Left Delim
+          delimTotal += rLength;
+          continue;
+        } else if (match[5] || match[6]) { // either Left or Right Delim
+          if (lLength % 3 && !((lLength + rLength) % 3)) {
+            midDelimTotal += rLength;
+            continue; // CommonMark Emphasis Rules 9-10
+          }
         }
-      }
-    }
-  }
 
-  em(src, maskedSrc, prevChar = '') {
-    let match = this.rules.inline.em.start.exec(src);
+        delimTotal -= rLength;
 
-    if (match && (!match[1] || (match[1] && (prevChar === '' || this.rules.inline.punctuation.exec(prevChar))))) {
-      maskedSrc = maskedSrc.slice(-1 * src.length);
-      const endReg = match[0] === '*' ? this.rules.inline.em.endAst : this.rules.inline.em.endUnd;
+        if (delimTotal > 0) continue; // Haven't found enough closing delimiters
 
-      endReg.lastIndex = 0;
+        // If this is the last rDelimiter, remove extra characters. *a*** -> *a*
+        if (delimTotal + midDelimTotal - rLength <= 0 && !maskedSrc.slice(endReg.lastIndex).match(endReg)) {
+          rLength = Math.min(rLength, rLength + delimTotal + midDelimTotal);
+        }
 
-      let cap;
-      while ((match = endReg.exec(maskedSrc)) != null) {
-        cap = this.rules.inline.em.middle.exec(maskedSrc.slice(0, match.index + 2));
-        if (cap) {
+        if (Math.min(lLength, rLength) % 2) {
           return {
             type: 'em',
-            raw: src.slice(0, cap[0].length),
-            text: src.slice(1, cap[0].length - 1)
+            raw: src.slice(0, lLength + match.index + rLength + 1),
+            text: src.slice(1, lLength + match.index + rLength)
+          };
+        }
+        if (Math.min(lLength, rLength) % 2 === 0) {
+          return {
+            type: 'strong',
+            raw: src.slice(0, lLength + match.index + rLength + 1),
+            text: src.slice(2, lLength + match.index + rLength - 1)
           };
         }
       }

test/specs/bug/adjacent_lists.html+1 −0 added

@@ -0,0 +1 @@
+<p><em>foo <strong>bar *baz bim</strong> bam</em></p>

test/specs/bug/adjacent_lists.md+1 −0 added

@@ -0,0 +1 @@
+*foo __bar *baz bim__ bam*

test/specs/commonmark/commonmark.0.29.json+22 −44 modified

@@ -2916,8 +2916,7 @@
     "example": 361,
     "start_line": 6390,
     "end_line": 6394,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "aa_\"bb\"_cc\n",
@@ -3125,17 +3124,15 @@
     "example": 387,
     "start_line": 6641,
     "end_line": 6645,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "__foo, __bar__, baz__\n",
     "html": "<p><strong>foo, <strong>bar</strong>, baz</strong></p>\n",
     "example": 388,
     "start_line": 6648,
     "end_line": 6652,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "foo-__(bar)__\n",
@@ -3287,8 +3284,7 @@
     "example": 407,
     "start_line": 6831,
     "end_line": 6835,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo *bar**\n",
@@ -3328,8 +3324,7 @@
     "example": 412,
     "start_line": 6888,
     "end_line": 6892,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo **bar***\n",
@@ -3353,17 +3348,15 @@
     "example": 415,
     "start_line": 6913,
     "end_line": 6917,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "foo******bar*********baz\n",
     "html": "<p>foo<strong><strong><strong>bar</strong></strong></strong>***baz</p>\n",
     "example": 416,
     "start_line": 6919,
     "end_line": 6923,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo **bar *baz* bim** bop*\n",
@@ -3427,17 +3420,15 @@
     "example": 424,
     "start_line": 6990,
     "end_line": 6994,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "____foo__ bar__\n",
     "html": "<p><strong><strong>foo</strong> bar</strong></p>\n",
     "example": 425,
     "start_line": 6997,
     "end_line": 7001,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "**foo **bar****\n",
@@ -3573,8 +3564,7 @@
     "example": 442,
     "start_line": 7129,
     "end_line": 7133,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "***foo**\n",
@@ -3598,17 +3588,15 @@
     "example": 445,
     "start_line": 7150,
     "end_line": 7154,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo****\n",
     "html": "<p><em>foo</em>***</p>\n",
     "example": 446,
     "start_line": 7157,
     "end_line": 7161,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "foo ___\n",
@@ -3664,53 +3652,47 @@
     "example": 453,
     "start_line": 7209,
     "end_line": 7213,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "_foo__\n",
     "html": "<p><em>foo</em>_</p>\n",
     "example": 454,
     "start_line": 7220,
     "end_line": 7224,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "___foo__\n",
     "html": "<p>_<strong>foo</strong></p>\n",
     "example": 455,
     "start_line": 7227,
     "end_line": 7231,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "____foo_\n",
     "html": "<p>___<em>foo</em></p>\n",
     "example": 456,
     "start_line": 7234,
     "end_line": 7238,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "__foo___\n",
     "html": "<p><strong>foo</strong>_</p>\n",
     "example": 457,
     "start_line": 7241,
     "end_line": 7245,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "_foo____\n",
     "html": "<p><em>foo</em>___</p>\n",
     "example": 458,
     "start_line": 7248,
     "end_line": 7252,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "**foo**\n",
@@ -3766,26 +3748,23 @@
     "example": 465,
     "start_line": 7307,
     "end_line": 7311,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "***foo***\n",
     "html": "<p><em><strong>foo</strong></em></p>\n",
     "example": 466,
     "start_line": 7316,
     "end_line": 7320,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "_____foo_____\n",
     "html": "<p><em><strong><strong>foo</strong></strong></em></p>\n",
     "example": 467,
     "start_line": 7323,
     "end_line": 7327,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo _bar* baz_\n",
@@ -3809,8 +3788,7 @@
     "example": 470,
     "start_line": 7348,
     "end_line": 7352,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo *bar baz*\n",

test/specs/gfm/commonmark.0.29.json+22 −44 modified

@@ -2916,8 +2916,7 @@
     "example": 361,
     "start_line": 6390,
     "end_line": 6394,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "aa_\"bb\"_cc\n",
@@ -3125,17 +3124,15 @@
     "example": 387,
     "start_line": 6641,
     "end_line": 6645,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "__foo, __bar__, baz__\n",
     "html": "<p><strong>foo, <strong>bar</strong>, baz</strong></p>\n",
     "example": 388,
     "start_line": 6648,
     "end_line": 6652,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "foo-__(bar)__\n",
@@ -3287,8 +3284,7 @@
     "example": 407,
     "start_line": 6831,
     "end_line": 6835,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo *bar**\n",
@@ -3328,8 +3324,7 @@
     "example": 412,
     "start_line": 6888,
     "end_line": 6892,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo **bar***\n",
@@ -3353,17 +3348,15 @@
     "example": 415,
     "start_line": 6913,
     "end_line": 6917,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "foo******bar*********baz\n",
     "html": "<p>foo<strong><strong><strong>bar</strong></strong></strong>***baz</p>\n",
     "example": 416,
     "start_line": 6919,
     "end_line": 6923,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo **bar *baz* bim** bop*\n",
@@ -3427,17 +3420,15 @@
     "example": 424,
     "start_line": 6990,
     "end_line": 6994,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "____foo__ bar__\n",
     "html": "<p><strong><strong>foo</strong> bar</strong></p>\n",
     "example": 425,
     "start_line": 6997,
     "end_line": 7001,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "**foo **bar****\n",
@@ -3573,8 +3564,7 @@
     "example": 442,
     "start_line": 7129,
     "end_line": 7133,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "***foo**\n",
@@ -3598,17 +3588,15 @@
     "example": 445,
     "start_line": 7150,
     "end_line": 7154,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo****\n",
     "html": "<p><em>foo</em>***</p>\n",
     "example": 446,
     "start_line": 7157,
     "end_line": 7161,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "foo ___\n",
@@ -3664,53 +3652,47 @@
     "example": 453,
     "start_line": 7209,
     "end_line": 7213,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "_foo__\n",
     "html": "<p><em>foo</em>_</p>\n",
     "example": 454,
     "start_line": 7220,
     "end_line": 7224,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "___foo__\n",
     "html": "<p>_<strong>foo</strong></p>\n",
     "example": 455,
     "start_line": 7227,
     "end_line": 7231,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "____foo_\n",
     "html": "<p>___<em>foo</em></p>\n",
     "example": 456,
     "start_line": 7234,
     "end_line": 7238,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "__foo___\n",
     "html": "<p><strong>foo</strong>_</p>\n",
     "example": 457,
     "start_line": 7241,
     "end_line": 7245,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "_foo____\n",
     "html": "<p><em>foo</em>___</p>\n",
     "example": 458,
     "start_line": 7248,
     "end_line": 7252,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "**foo**\n",
@@ -3766,26 +3748,23 @@
     "example": 465,
     "start_line": 7307,
     "end_line": 7311,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "***foo***\n",
     "html": "<p><em><strong>foo</strong></em></p>\n",
     "example": 466,
     "start_line": 7316,
     "end_line": 7320,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "_____foo_____\n",
     "html": "<p><em><strong><strong>foo</strong></strong></em></p>\n",
     "example": 467,
     "start_line": 7323,
     "end_line": 7327,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo _bar* baz_\n",
@@ -3809,8 +3788,7 @@
     "example": 470,
     "start_line": 7348,
     "end_line": 7352,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo *bar baz*\n",

test/specs/new/em_list_links.html+8 −9 modified

@@ -14,10 +14,10 @@
 </ul>
 </li>
 <li>bold italic<ul>
-<li><a href="https://www.google.com"><strong><em>named link</em></strong></a></li>
-<li><strong><em><a href="https://www.google.com">named link</a></em></strong></li>
-<li><a href="https://www.google.com"><strong><em>named link</em></strong></a></li>
-<li><strong><em><a href="https://www.google.com">named link</a></em></strong></li>
+<li><a href="https://www.google.com"><em><strong>named link</strong></em></a></li>
+<li><em><strong><a href="https://www.google.com">named link</a></strong></em></li>
+<li><a href="https://www.google.com"><em><strong>named link</strong></em></a></li>
+<li><em><strong><a href="https://www.google.com">named link</a></strong></em></li>
 <li><a href="https://www.google.com"><em><strong>named link</strong></em></a></li>
 <li><a href="https://www.google.com"><strong><em>named link</em></strong></a></li>
 <li><strong><em><a href="https://www.google.com">named link</a></em></strong></li>
@@ -42,14 +42,13 @@
 </ul>
 </li>
 <li>code bold italic<ul>
-<li><a href="https://www.google.com"><strong><em><code>named link</code></em></strong></a></li>
-<li><strong><em><a href="https://www.google.com"><code>named link</code></a></em></strong></li>
-<li><a href="https://www.google.com"><strong><em><code>named link</code></em></strong></a></li>
-<li><strong><em><a href="https://www.google.com"><code>named link</code></a></em></strong></li>
+<li><a href="https://www.google.com"><em><strong><code>named link</code></strong></em></a></li>
+<li><em><strong><a href="https://www.google.com"><code>named link</code></a></strong></em></li>
+<li><a href="https://www.google.com"><em><strong><code>named link</code></strong></em></a></li>
+<li><em><strong><a href="https://www.google.com"><code>named link</code></a></strong></em></li>
 <li><a href="https://www.google.com"><em><strong><code>named link</code></strong></em></a></li>
 <li><a href="https://www.google.com"><strong><em><code>named link</code></em></strong></a></li>
 <li><strong><em><a href="https://www.google.com"><code>named link</code></a></em></strong></li>
 </ul>
 </li>
 </ul>
-

test/specs/original/strong_and_em_together.html+0 −7 removed

@@ -1,7 +0,0 @@
-<p><strong><em>This is strong and em.</em></strong></p>
-
-<p>So is <strong><em>this</em></strong> word.</p>
-
-<p><strong><em>This is strong and em.</em></strong></p>
-
-<p>So is <strong><em>this</em></strong> word.</p>

test/specs/original/strong_and_em_together.md+0 −7 removed

@@ -1,7 +0,0 @@
-***This is strong and em.***
-
-So is ***this*** word.
-
-___This is strong and em.___
-
-So is ___this___ word.

test/specs/redos/quadratic_underscores.js+4 −0 added

@@ -0,0 +1,4 @@
+module.exports = {
+  markdown: `${'_'.repeat(101)} a`,
+  html: `<p>${'_'.repeat(101)} a</p>`
+};

Vulnerability mechanics

Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

github.com/advisories/GHSA-4r62-v4vq-hr96ghsaADVISORY
nvd.nist.gov/vuln/detail/CVE-2021-21306ghsaADVISORY
github.com/markedjs/marked/commit/7293251c438e3ee968970f7609f1a27f9007bccdghsax_refsource_MISCWEB
github.com/markedjs/marked/issues/1927ghsax_refsource_MISCWEB
github.com/markedjs/marked/pull/1864ghsax_refsource_MISCWEB
github.com/markedjs/marked/security/advisories/GHSA-4r62-v4vq-hr96ghsax_refsource_CONFIRMWEB
www.npmjs.com/package/markedghsax_refsource_MISCWEB

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cvss	0.260
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000