JSFiddle - React, Tailwind, and code Playground

HTML

http://www.youtube.com/watch?v=t-ZRX8984sc

http://youtu.be/t-ZRX8984sc

JavaScript

$('body').html(function(i, html) {

    return html.replace(/(?:http:\/\/)?(?:www\.)?(?:youtube\.com|youtu\.be)\/(?:watch\?v=)?(.+)/g, '<iframe width="420" height="345" src="http://www.youtube.com/embed/$1" frameborder="0" allowfullscreen></iframe>');

});