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<?php $matches=array(); preg_match("[0-9]{3}-?[0-9]{3}","230474",$matches); var_dump($matches);
based on IlneK
Output for 4.3.11 - 7.1.0
Warning: preg_match(): Unknown modifier '{' in /in/FYIBp on line 4 array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '{' in /in/FYIBp on line 4 array(0) { }