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<?php $string = '1111-1112-3333-4444'; var_dump(substr(preg_replace('[^0-9+]/i', '', $string), 0, 6));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_replace(): Unknown modifier '/' in /in/4Nsta on line 5 Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /in/4Nsta on line 5 string(0) ""

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