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run code in 150+ php & hhvm versions
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<?php preg_match_all( '/\d/', 'cpou1', $matches ); print_r($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
Array ( [0] => Array ( [0] => 1 ) )