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<?php $matches=array(); preg_match_all("(?[0-9]{3})?-?[0-9]{3}","230474",$matches); var_dump($matches);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_match_all(): Unknown modifier '?' in /in/s8qDe on line 4 array(0) { }

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