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<?php $lastRule = "Abc1234"; var_dump(preg_match('/^(.+)\d{4}$/', $lastRule, $m)); var_dump($m);
Output for 4.3.0 - 7.1.7
int(1) array(2) { [0]=> string(7) "Abc1234" [1]=> string(3) "Abc" }