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<?php $lastRule = "Abc122221234"; var_dump(preg_match('/^(.+)\d{4}$/', $lastRule, $m)); var_dump($m);
Output for 4.3.0 - 7.1.0
int(1) array(2) { [0]=> string(12) "Abc122221234" [1]=> string(8) "Abc12222" }