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<?php $matches=array(); preg_match_all("(?[0-9]{3})?-?[0-9]{3}","230474",$matches); var_dump($matches);
based on Ku330
Output for 4.3.11 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match_all(): Unknown modifier '?' in /in/s8qDe on line 4 array(0) { }
Output for hhvm-3.10.0 - 3.12.0
Warning: Unknown modifier '?': [(?[0-9]{3})?-?[0-9]{3}] in /in/s8qDe on line 4 array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '?' in /in/s8qDe on line 4 array(0) { }