Markdown brush for SyntaxHighlighter

shBrushMarkdown.js

/**
 * SyntaxHighlighter
 * http://alexgorbatchev.com/SyntaxHighlighter
 *
 * SyntaxHighlighter is donationware. If you are using it, please donate.
 * http://alexgorbatchev.com/SyntaxHighlighter/donate.html
 * 
 * @version
 * 3.0.83 (July 02 2010)
 * 
 * @copyright
 * Copyright (C) 2004-2010 Alex Gorbatchev.
 * 
 * @license
 * Dual licensed under the MIT and GPL licenses.
 */

/**
 * shBrushMarkdown.js
 * https://gist.github.com/1979689
 * 
 * @version
 * 1.0.0 (March 06 2012)
 * 
 * @copyright
 * copyright (C) 2012 hekt <http://www.hekt.org/>.
 * 
 * @license
 * MIT license
 */

;(function() {
  // CommonJS
  typeof(require) != 'undefined' ? SyntaxHighlighter = require('shCore').SyntaxHighlighter : null;

  function Brush() {
	this.regexList = [
      {regex: SyntaxHighlighter.regexLib.xmlComments, 
       css: 'comments'},        // comments
      {regex: new RegExp('.+\\n([=-]{4,})', 'gm'), 
       css: 'functions' },      // headers
      {regex: new RegExp('^#+\\s+.*', 'gm'), 
       css: 'functions' },      // headers
      {regex: new RegExp('^(>|&gt;)\\s+.*', 'gm'), 
       css: 'string' },         // blockquotes
      {regex: new RegExp('^([0-9]+.|[*+-])\\s', 'gm'), 
       css: 'keyword' },        // lists
      {regex: new RegExp('\\n\\n((\\s{4,}|\\t).*\\n?)+', 'gm'), 
       css: 'constants' },      // code block
      {regex: new RegExp('^([*-_])(\\1{2,}|(\\s\\1){2,}).*', 'gm'), 
       css: 'functions' },      // horizontal rules
      {regex: new RegExp('\\!?\\[[^\\]]*\\]\\s?(\\([^\\)]*\\)|\\[[^\\]]*\\])',
                         'gm'), 
       css: 'keyword'},         // links and images
      {regex: new RegExp('^\\s{0,3}\\[[^\\]]*\\]:\\s.*', 'gm'), 
       css: 'string'},          // references
      {regex: new RegExp('\\*([^*\\s]([^*]|\\\\\\*)*[^*\\s]|[^*\\s])\\*', 
                         'gm'), 
       css: 'italic' },         // emphasis *
      {regex: new RegExp('\\_([^_\\s]([^_]|\\\\_)*[^_\\s]|[^_\\s])_', 'gm'), 
       css: 'italic' },         // emphasis _
      {regex: new RegExp('\\*{2}([^\\s]([^*]|\\\\\\*\\*|[^*]\\*[^*])*[^\\s]|[^*\\s])\\*{2}', 
                         'gm'), 
       css: 'bold' },           // emphasis **
      {regex: new RegExp('__([^\\s]([^_]|\\\\__|[^_]_[^_])*[^\\s]|[^_\\s])__',
                         'gm'), 
       css: 'bold' },           // emphasis __
      {regex: new RegExp('`(\\\\`|[^`])+`', 'gm'), 
       css: 'constants' },      // code `
      {regex: new RegExp('(`{2,}).*\\1', 'gm'), 
       css: 'constants' },      // code ``
      {regex: new RegExp('(<|&lt;).+[:@].+(>|&gt;)', 'gm'), 
       css: 'keyword' }         // automatic links
    ];
  };

  Brush.prototype = new SyntaxHighlighter.Highlighter();
  Brush.aliases	= ['md', 'mdt', 'markdown'];

  SyntaxHighlighter.brushes.Markdown = Brush;

  // CommonJS
  typeof(exports) != 'undefined' ? exports.Brush = Brush : null;
})();

Note: If you are attempting to add this to Conlfuence's Code Macro as an additional language, you may need to line 34 to read:

SyntaxHighlighter = SyntaxHighlighter || (typeof require !== 'undefined' ? require('shCore').SyntaxHighlighter : null);

This line was stolen from the test fixtures for v3 brushes here: https://github.com/syntaxhighlighter/syntaxhighlighter/blob/master/tests/fixtures/test_brush_v3.js