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<?php $str = "https://www.youtube.com/watch?v=kS4e4ozg0HU"; echo preg_match('/^https://www.youtube.com/watch?v=(.*)/', $str);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_match(): Unknown modifier '/' in /in/D31oM on line 4

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