allow colons in tag names and attributes. Decrease group depth in regex

lib/marked.js

@@ -463,7 +463,7 @@ var inline = {
   escape: /^\\([\\`*{}\[\]()#+\-.!_>])/,
   autolink: /^<(scheme:[^\s\x00-\x1f<>]*|email)>/,
   url: noop,
-  tag: /^comment|^<\/[a-zA-Z][\w\-]*\s*>|^<[a-zA-Z][\w\-]*(?:\s+[\w:-]+(?:\s*=\s*(?:"[^"]*"|'[^']*'|[^\s"'=<>`]+))?)*?\s*\/?>|^<\?[\s\S]*?\?>|^<![a-zA-Z]+\s[\s\S]*?>|^<!\[CDATA\[[\s\S]*?\]\]>/,
+  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: /^!?\[(inside)\]\(href\)/,
   reflink: /^!?\[(inside)\]\s*\[([^\]]*)\]/,
   nolink: /^!?\[((?:\[[^\]]*\]|\\[\[\]]|[^\[\]])*)\]/,
@@ -483,8 +483,11 @@ inline.autolink = edit(inline.autolink)
   .replace('email', inline._email)
   .getRegex();
 
+inline._attribute = /\s+[\w:-]+(?:\s*=\s*"[^"]*"|\s*=\s*'[^']*'|\s*=\s*[^\s"'=<>`]+)?/;
+
 inline.tag = edit(inline.tag)
   .replace('comment', block._comment)
+  .replace('attribute', inline._attribute)
   .getRegex();
 
 inline._inside = /(?:\[[^\]]*\]|\\[\[\]]|[^\[\]]|\](?=[^\[]*\]))*/;