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<?php preg_match('/(*MARK:A)a/', 'a', $matches); var_dump($matches);
Output for 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.26, 8.3.0 - 8.3.15, 8.4.1 - 8.4.2
array(2) { [0]=> string(1) "a" ["MARK"]=> string(1) "A" }
Output for 5.5.0 - 5.5.35
array(1) { [0]=> string(1) "a" }

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97.74 ms | 406 KiB | 5 Q