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<?php $string = '<iframe width="640" height="360" src="http://www.youtube.com/embed/h9jOaIB1VGo?rel=0&wmode=transparent" frameborder="0" allowfullscreen></iframe>'; preg_match('/(youtu\.be\/|youtube\.com\/(watch\?(.*&)?v=|(embed|v)\/))([^\?&"\'>]+)/', $string, $matches); var_dump($matches);
Output for git.master, git.master_jit, rfc.property-hooks
array(6) { [0]=> string(29) "youtube.com/embed/h9jOaIB1VGo" [1]=> string(18) "youtube.com/embed/" [2]=> string(6) "embed/" [3]=> string(0) "" [4]=> string(5) "embed" [5]=> string(11) "h9jOaIB1VGo" }

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