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run code in 150+ php & hhvm versions
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<?php $string = "00 a 51 - a9"; preg_match_all("/(\d*)(\D*)/", $string, $matches); print_r($matches);
Output for 4.3.0 - 7.1.0
Array ( [0] => Array ( [0] => 00 a [1] => 51 - a [2] => 9 [3] => ) [1] => Array ( [0] => 00 [1] => 51 [2] => 9 [3] => ) [2] => Array ( [0] => a [1] => - a [2] => [3] => ) )