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<?php preg_match('/(*MARK:A)a/', 'a', $matches); var_dump($matches);
Output for 5.6.0 - 7.2.0
array(2) { [0]=> string(1) "a" ["MARK"]=> string(1) "A" }
Output for 5.5.0 - 5.5.35
array(1) { [0]=> string(1) "a" }