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<?php $str = 'test1'; preg_match_all('!\d+!', $str, $matches); var_dump($matches);
based on ZJZpn
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0beta1
array(1) { [0]=> array(1) { [0]=> string(1) "1" } }