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run code in 150+ php & hhvm versions
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<?php preg_match_all('/(\d+)(?:\]|,|\s+)/', '[1, 2, 3]', $matches); var_dump($matches);
based on s0Zbq
Output for 4.3.0 - 7.1.0
array(2) { [0]=> array(3) { [0]=> string(2) "1," [1]=> string(2) "2," [2]=> string(2) "3]" } [1]=> array(3) { [0]=> string(1) "1" [1]=> string(1) "2" [2]=> string(1) "3" } }