Grab youtube id from any anything possibly inserted into youtube text tv
<?php
preg_match('#(\.be/|/embed/|/v/|/watch\?v=)([A-Za-z0-9_-]{5,11})#', $iframe, $matches);
if(isset($matches[2]) && $matches[2] != ''){
$youtubeID = $matches[2];
}
$modx->setPlaceholder($ph,$youtubeID);
return;