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run code in 200+ php & hhvm versions
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<?php preg_match('/(?:AAA)(.*)/i', 'AA', $matchs); var_dump($matchs);
based on 74N3G
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
array(0) { }