tiymce, find youtube url, replace it with embed iframe

function tiymce() {
  var iframe = /<iframe.*<\/iframe>/gi;
  var youtube = /(http:\/\/www\.youtube\.com\/embed\/.*)/gi;
  var url = /(https?:\/\/(?:www\.|(?!www))[^\s\.]+\.[^\s]{2,}|www\.[^\s]+\.[^\s]{2,})\/?/gi;
  var content = tiymce.getContent();
  var matches = content.match(iframe) || content.match(youtube) || content.match(url);
  if (matches) {
    var link = matches[0].match(url);
    if (link) {
      link = link[0].match(youtube);
      if (link) {
        link = link[0].replace('embed/', '').replace('www.', '');
      } else {
        link = matches[0].match(url)[0];
      }
      url = '<a href="' + link + '