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<?php $string="1001-sdfjh"; $matches=array(); $preg_match("/^\d{4}/", $string, $matches); print_r($matches); ?>
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $preg_match in /in/7ttOl on line 6 Fatal error: Uncaught Error: Value of type null is not callable in /in/7ttOl:6 Stack trace: #0 {main} thrown in /in/7ttOl on line 6
Process exited with code 255.

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