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<?php preg_match("/^(?<NAME_A>aaa)(?:(?<NAME_B>x)?)/", "aaay", $matches, PREG_UNMATCHED_AS_NULL); var_dump($matches);
Output for git.master, git.master_jit, rfc.property-hooks
array(5) { [0]=> string(3) "aaa" ["NAME_A"]=> string(3) "aaa" [1]=> string(3) "aaa" ["NAME_B"]=> NULL [2]=> NULL }

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