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<?php preg_match('/(?:AAA)(.*)/i', 'AAA', $matchs); var_dump($matchs);
Output for 5.6.0 - 5.6.38, hhvm-3.15.4 - 3.22.0, 7.0.0 - 7.2.11
array(2) { [0]=> string(3) "AAA" [1]=> string(0) "" }