[solution] Embed youtube in forum

// SCRIPT TO TRANSFORM YOUTUBE LINKS INTO EMBEDDED VIDEO
// 1. ADD div with ID="tubify" to pages where transform is needed.
// 2. Link to this script from the footer

//<![CDATA[

    window.onload=function(){
      
createYoutubeEmbed = (key) => {
  return '<iframe width="711" height="400" src="https://www.youtube.com/embed/' + key + '" frameborder="0" allowfullscreen></iframe><br>';
};

transformYoutubeLinks = (text) => {
  if (!text) return text;
  const self = this;

  const linkreg = /(?:)<a>]+)>(.+?)<\/a>/g;
  const fullreg = /(https?:\/\/)?(www\.)?(youtube\.com\/watch\?v=|youtu\.be\/)([^& \n<]+)(?:[^ \n<]+)?/g;
  const regex = /(?:https?:\/\/)?(?:www\.)?(?:youtube\.com\/watch\?v=|youtu\.be\/)([^& \n<]+)(?:[^ \n<]+)?/g;

  let resultHtml = text;  

  // get all the matches for youtube links using the first regex
  const match = text.match(fullreg);
  if (match && match.length > 0) {
    // get all links and put in placeholders
    const matchlinks = text.match(linkreg);
    if (matchlinks && matchlinks.length > 0) {
      for (var i=0; i < matchlinks.length; i++) {
        resultHtml = resultHtml.replace(matchlinks[i], "#placeholder" + i + "#");
      }
    }

    // now go through the matches one by one
    for (var i=0; i < match.length; i++) {
      // get the key out of the match using the second regex
      let matchParts = match[i].split(regex);
      // replace the full match with the embedded youtube code
      resultHtml = resultHtml.replace(match[i], self.createYoutubeEmbed(matchParts[1]));
    }

    // ok now put our links back where the placeholders were.
    if (matchlinks && matchlinks.length > 0) {
      for (var i=0; i < matchlinks.length; i++) {
        resultHtml = resultHtml.replace("#placeholder" + i + "#", matchlinks[i]);
      }
    }
  }
  return resultHtml;
};

const htmlContent = document.getElementById('tubify');
htmlContent[removed] = transformYoutubeLinks(htmlContent[removed]);

    }

  //]]>

{include:thread_rows}

<div id="tubify">
{include:thread_rows}
</div>

</body>

script src="https://domain/index.php/template_group/tubify"
</body>