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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*)(\w*)/", $string, $matches); print_r($matches);
Output for 4.3.0 - 7.1.0
Array ( [0] => Array ( [0] => 00 [1] => [2] => a [3] => [4] => 51 [5] => [6] => [7] => [8] => a9 [9] => ) [1] => Array ( [0] => 00 [1] => [2] => [3] => [4] => 51 [5] => [6] => [7] => [8] => [9] => ) [2] => Array ( [0] => [1] => [2] => a [3] => [4] => [5] => [6] => [7] => [8] => a9 [9] => ) )