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<?php $str = 'https://www.youtube.com/watch?v=UiyDmqO59QE'; if (preg_match('/(youtu\.be\/|youtube\.com\/(watch\?(.*&)?v=|(embed|v)\/))([^\?&"\'>]+)/', $str, $matches)) { var_dump( $matches ); }
Output for git.master, git.master_jit, rfc.property-hooks
array(6) { [0]=> string(31) "youtube.com/watch?v=UiyDmqO59QE" [1]=> string(20) "youtube.com/watch?v=" [2]=> string(8) "watch?v=" [3]=> string(0) "" [4]=> string(0) "" [5]=> string(11) "UiyDmqO59QE" }

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