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run code in 200+ php & hhvm versions
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<?php $re = '/(?<=\w)(?=(?:\w\w)+$)/m'; $str = '121510'; preg_match_all($re, $str, $matches); // Print the entire match result var_dump($matches);
based on QnCGH
Output for 5.6.38 - 7.3.0rc3
array(1) { [0]=> array(2) { [0]=> string(0) "" [1]=> string(0) "" } }