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<?php $_content = '<iframe src="//player.vimeo.com/video/36899035" width="500" height="281" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe> <p><a href="http://vimeo.com/36899035">Moving a Tree</a> from <a href="http://vimeo.com/user4457549">Avery Lawrence</a> on <a href="https://vimeo.com">Vimeo</a>.</p>'; preg_match('#vimeo.com[^\'"\/]*([0-9]{6,10})#i',$_content, $matches); var_dump($matches); echo $_content;
Output for git.master, git.master_jit, rfc.property-hooks
array(0) { } <iframe src="//player.vimeo.com/video/36899035" width="500" height="281" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe> <p><a href="http://vimeo.com/36899035">Moving a Tree</a> from <a href="http://vimeo.com/user4457549">Avery Lawrence</a> on <a href="https://vimeo.com">Vimeo</a>.</p>

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