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<?php preg_match('~(waa)|(meukee)|(trololo)~i', 'meukee', $matches); var_dump($matches);
Output for 4.3.0 - 7.1.10
array(3) { [0]=> string(6) "meukee" [1]=> string(0) "" [2]=> string(6) "meukee" }