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run code in 150+ php & hhvm versions
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<?php preg_match('~(waa)|(meukee)|(trololo)|(abcabc)~i', 'meukee', $matches); var_dump($matches); preg_match('~(waa)|(meukee)|(trololo)|(abcabc)~i', 'trololo', $matches); var_dump($matches); preg_match('~(waa)|(meukee)|(trololo)|(abcabc)~i', 'waa', $matches); var_dump($matches);
based on 0mDUu
Output for 4.3.0 - 7.1.0
array(3) { [0]=> string(6) "meukee" [1]=> string(0) "" [2]=> string(6) "meukee" } array(4) { [0]=> string(7) "trololo" [1]=> string(0) "" [2]=> string(0) "" [3]=> string(7) "trololo" } array(2) { [0]=> string(3) "waa" [1]=> string(3) "waa" }