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<?php $arr = [0]; preg_match('error', 'abc', $arr[1]); var_dump($arr);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_match(): Delimiter must not be alphanumeric, backslash, or NUL in /in/37dc5 on line 4 array(2) { [0]=> int(0) [1]=> NULL }

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