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<?php preg_match('/(foo)(bar)(baz)?/', 'foobar', $matches, PREG_UNMATCHED_AS_NULL); var_dump($matches);
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { [0]=> string(6) "foobar" [1]=> string(3) "foo" [2]=> string(3) "bar" [3]=> NULL }

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