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run code in 150+ php & hhvm versions
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<?php $nickname = "johnsmith123"; preg_match_all('!\d+!', $nickname, $numbers); print_r($numbers);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => Array ( [0] => 123 ) )