index.js

module.exports = function(md, options) {
  options = options || {};
  options.stripListLeaders = options.hasOwnProperty('stripListLeaders') ? options.stripListLeaders : true;
  options.gfm = options.hasOwnProperty('gfm') ? options.gfm : true;

  var output = md;
  try {
    if (options.stripListLeaders) {
      output = output.replace(/^([\s\t]*)([\*\-\+]|\d\.)\s+/gm, '$1');
    }
    if (options.gfm){
      output = output
        // Header
        .replace(/\n={2,}/g, '\n')
        // Strikethrough
        .replace(/~~/g, '')
        // Fenced codeblocks
        .replace(/`{3}.*\n/g, '');
    }
    output = output
      // Remove HTML tags
      .replace(/<[\w|\s|=|\'|\"|\:|\(|\)|\,|\;|\/|0-9|\.|-]+[>|\\>]/g, '')
      // Remove setext-style headers
      .replace(/^[=\-]{2,}\s*$/g, '')
      // Remove footnotes?
      .replace(/\[\^.+?\](\: .*?$)?/g, '')
      .replace(/\s{0,2}\[.*?\]: .*?$/g, '')
      // Remove images
      .replace(/\!\[.*?\][\[\(].*?[\]\)]/g, '')
      // Remove inline links
      .replace(/\[(.*?)\][\[\(].*?[\]\)]/g, '$1')
      // Remove Blockquotes
      .replace(/>/g, '')
      // Remove reference-style links?
      .replace(/^\s{1,2}\[(.*?)\]: (\S+)( ".*?")?\s*$/g, '')
      // Remove atx-style headers
      .replace(/^\#{1,6}\s*([^#]*)\s*(\#{1,6})?/gm, '$1')
      .replace(/([\*_]{1,3})(\S.*?\S)\1/g, '$2')
      .replace(/(`{3,})(.*?)\1/gm, '$2')
      .replace(/^-{3,}\s*$/g, '')
      .replace(/`(.+?)`/g, '$1')
      .replace(/\n{2,}/g, '\n\n');
  } catch(e) {
    console.error(e);
    return md;
  }
  return output;
};