preg_replace("/s*[a-zA-Z//:.]*youtube.com/watch?v=([a-zA-Z0-9-_]+)([a-zA-Z0-9/*-\_?&;\%=.]*)/i","<iframe width="420" height="315" src="//www.youtube.com/embed/$1" frameborder="0" allowfullscreen></iframe>",$post_details['description']);