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run code in 150+ php & hhvm versions
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<?php $string = 'a9ass09ag89g67a'; $regex = '/[0-9]/'; preg_match_all($regex, $string, $matches); print_r($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [0] => Array ( [0] => 9 [1] => 0 [2] => 9 [3] => 8 [4] => 9 [5] => 6 [6] => 7 ) )
Output for hhvm-3.10.0

Process exited with code 153.