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<?php preg_match('/^[\w][\w-.]+@[\w-.]+\.[a-z]{2,4}$/U', abcde, $found); print_r($found);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Undefined constant "abcde" in /in/Ei8S6:2 Stack trace: #0 {main} thrown in /in/Ei8S6 on line 2
Process exited with code 255.

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