<?php function youtube($string) {return preg_replace('~\[v\](\d+)\[\/v\]~ius', '<iframe width="340" height="176" src="http://www.youtube.com/embed/$1?rel=0" frameborder="0" allowfullscreen="true"></iframe>', $string);} print youtube('test[v]66666[/v]test[v]non_processed[/v][v]123456[/v]');
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