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<?php $_content = '[iframe scrolling="no" src="https://w.soundcloud.com/player/?url=https%3A//api.soundcloud.com/tracks/163969592&color=ff5500&auto_play=false&hide_related=false&show_comments=true&show_user=true&show_reposts=false" frameborder="no" height="166" width="100%"]'; if(preg_match('#[<\[](iframe [^>\]]*?(soundcloud.com|youtu|vimeo)[^>\]]*?)[>\]]#i', $_content, $matches) > 0) var_dump($matches);

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