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run code in 150+ php & hhvm versions
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<?php preg_match('/la((b(a))*)/','lababababa',$match); var_dump($match);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> string(10) "lababababa" [1]=> string(8) "babababa" [2]=> string(2) "ba" [3]=> string(1) "a" }
Output for hhvm-3.10.0

Process exited with code 153.