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<?php function check_link($link) { if(preg_match("#(?<=v=)[a-zA-Z0-9-]+(?=&)|(?<=v\/)[^&\n]+(?=\?)|(?<=v=)[^&\n]+|(?<=youtu.be/)[^&\n]+#", $link, $r)) { $pattern = '#<a\s?href="(https?:\/\/(?:www.)?[\w.\#\/?=]+)">\1<\/a>#is'; return preg_replace($pattern,'<iframe width="560" height="315" src="https://www.youtube.com/embed/'.$r[0].'" frameborder="0"></iframe>',$link); } } echo check_link('<a href="https://www.youtube.com/watch?v=Z7Oc8QaM5VU">https://www.youtube.com/watch?v=Z7Oc8QaM5VU</a>');
Output for git.master, git.master_jit, rfc.property-hooks
<iframe width="560" height="315" src="https://www.youtube.com/embed/Z7Oc8QaM5VU">https://www.youtube.com/watch?v=Z7Oc8QaM5VU</a>" frameborder="0"></iframe>

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