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<?php $str = '05/21/2018 ghijkl 06/12/2018 mnopqrst'; $result = preg_split('@(\b\d{1,2}/\d{1,2}/\d{4}\b)@', $str, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY); var_dump($result);
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array(4) { [0]=> string(10) "05/21/2018" [1]=> string(8) " ghijkl " [2]=> string(10) "06/12/2018" [3]=> string(9) " mnopqrst" }

preferences:
103.27 ms | 1614 KiB | 4 Q