markdown.js

module.exports = function(hljs) {
  return {
    contains: [
      // highlight headers
      {
        className: 'header',
        begin: '^#{1,3}', end: '$'
      },
      {
        className: 'header',
        begin: '^.+?\\n[=-]{2,}$'
      },
      // inline html
      {
        begin: '<', end: '>',
        subLanguage: 'xml',
        relevance: 0
      },
      // lists (indicators only)
      {
        className: 'bullet',
        begin: '^([*+-]|(\\d+\\.))\\s+'
      },
      // strong segments
      {
        className: 'strong',
        begin: '[*_]{2}.+?[*_]{2}'
      },
      // emphasis segments
      {
        className: 'emphasis',
        begin: '\\*.+?\\*'
      },
      {
        className: 'emphasis',
        begin: '_.+?_',
        relevance: 0
      },
      // blockquotes
      {
        className: 'blockquote',
        begin: '^>\\s+', end: '$'
      },
      // code snippets
      {
        className: 'code',
        begin: '`.+?`'
      },
      {
        className: 'code',
        begin: '^    ', end: '$',
        relevance: 0
      },
      // horizontal rules
      {
        className: 'horizontal_rule',
        begin: '^-{3,}', end: '$'
      },
      // using links - title and link
      {
        begin: '\\[.+?\\]\\(.+?\\)',
        returnBegin: true,
        contains: [
          {
            className: 'link_label',
            begin: '\\[.+\\]'
          },
          {
            className: 'link_url',
            begin: '\\(', end: '\\)',
            excludeBegin: true, excludeEnd: true
          }
        ]
      }
    ]
  };
};