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run code in 150+ php & hhvm versions
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<?php preg_match("/(\w+)?/", "ww",$matches); print_r($matches); echo "\n"; preg_match("/(\w*)/", "rr rt",$matches); print_r($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [0] => ww [1] => ww ) Array ( [0] => rr [1] => rr )
Output for hhvm-3.10.0

Process exited with code 153.