A handy javascript function for parsing YouTube urls and returning just the video URI (adapted from: http://stackoverflow.com/posts/9102270/revisions).

parse_youtube_url

function parse_youtube_url(url) {
	var regExp = /^.*(youtu.be\/|v\/|u\/\w\/|embed\/|watch\?v=v=|\&v=)([^#\&\?]*).*/;
	var match = url.match(regExp);
	if (match&&match[2].length==11){
	    return match[2];
	}else{
	    //error
	}
}