3v4l.org

run code in 500+ PHP versions simultaneously
<?php $re = '/\w+(?<=ab)(.*?)(?=xx)/m'; $str = '100abababab3x3x3xx1000morewords'; preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0); // Print the entire match result echo $matches[0][1];
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
3x3x3

preferences:
111.33 ms | 1943 KiB | 4 Q