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<?php $subject = 'abcabc'; preg_match_all('/ab(?:(?!ab).)*/', $subject, $matches); var_dump($matches);
based on 5gvVn
Output for 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.30 - 7.2.8
array(1) { [0]=> array(2) { [0]=> string(3) "abc" [1]=> string(3) "abc" } }