3v4l.org

run code in 150+ php & hhvm versions
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<?php preg_match('~(a)*~', str_repeat('a', 30000), $match); var_dump($match);
Output for hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0RC5
array(0) { }
Output for 4.3.0 - 5.6.21

Process exited with code 139.