3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = "{random_one}[SUBSTRING1] blah blah blah {random_two}[SUBSTRING2] blah blah blah{random_one}[SUBSTRING3]"; preg_match_all("/(\[.+?\])/i", $string, $matches); var_dump($matches);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 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(2) { [0]=> array(3) { [0]=> string(12) "[SUBSTRING1]" [1]=> string(12) "[SUBSTRING2]" [2]=> string(12) "[SUBSTRING3]" } [1]=> array(3) { [0]=> string(12) "[SUBSTRING1]" [1]=> string(12) "[SUBSTRING2]" [2]=> string(12) "[SUBSTRING3]" } }
preferences:
100.36 ms | 2063 KiB | 4 Q