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<?php var_dump(preg_match('/^get([a-z0-9_]+)service$/i', 'getDupa_666Service', $m)); print_r($m);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(1) Array ( [0] => getDupa_666Service [1] => Dupa_666 )