Convert Markdown to JIRA markup

md2jira.js

// https://github.com/FokkeZB/J2M/blob/master/script.js

function toJ(converted) {
  converted = converted.replace(/^(.*?)\n([=-])+$/gm, function (match,content,level) {
    return 'h' + (level[0] === '=' ? 1 : 2) + '. ' + content;
  });

  converted = converted.replace(/^([#]+)(.*?)$/gm, function (match,level,content) {
    return 'h' + level.length + '.' + content;
  });

  converted = converted.replace(/([*_]+)(.*?)\1/g, function (match,wrapper,content) {
    var to = (wrapper.length === 1) ? '_' : '*';
    return to + content + to;
  });

  // Make multi-level bulleted lists work
  converted = converted.replace(/^(\s*)- (.*)$/gm, function (match,level,content) {
    var len = 2;
    if(level.length > 0) {
        len = parseInt(level.length/4.0) + 2;
    }
    return Array(len).join("-") + ' ' + content;
  });

  var map = {
    cite: '??',
    del: '-',
    ins: '+',
    sup: '^',
    sub: '~'
  };

  converted = converted.replace(new RegExp('<(' + Object.keys(map).join('|') + ')>(.*?)<\/\\1>', 'g'), function (match,from,content) {
    console.log(from);
    var to = map[from];
    return to + content + to;
  });

  converted = converted.replace(/~~(.*?)~~/g, '-$1-');

  converted = converted.replace(/`{3,}(\w+)?((?:\n|[^`])+)`{3,}/g, function(match, synt, content) {
    var code = '{code';

    if (synt) {
      code += ':' + synt;
    }

    code += '}' + content + '{code}';

    return code;
  });

  converted = converted.replace(/`([^`]+)`/g, '{{$1}}');

  converted = converted.replace(/\[([^\]]+)\]\(([^)]+)\)/g, '[$1|$2]');
  converted = converted.replace(/<([^>]+)>/g, '[$1]');

  return converted;
}

toJ(document.kmvar.jira_markdown);