prevent catastrophic backtracking on em rule. fixes #497.

markedjs · Jul 29, 2015 · a37bd64 · a37bd64
1 parent 49b7eac
commit a37bd64
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/lib/marked.js b/lib/marked.js
@@ -456,7 +456,7 @@ var inline = {
   reflink: /^!?\[(inside)\]\s*\[([^\]]*)\]/,
   nolink: /^!?\[((?:\[[^\]]*\]|[^\[\]])*)\]/,
   strong: /^__([\s\S]+?)__(?!_)|^\*\*([\s\S]+?)\*\*(?!\*)/,
-  em: /^\b_((?:__|[\s\S])+?)_\b|^\*((?:\*\*|[\s\S])+?)\*(?!\*)/,
+  em: /^\b_((?:[^_]|__)+?)_\b|^\*((?:\*\*|[\s\S])+?)\*(?!\*)/,
   code: /^(`+)\s*([\s\S]*?[^`])\s*\1(?!`)/,
   br: /^ {2,}\n(?!\s*$)/,
   del: noop,