3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string1 = "sqrtpdrt"; // matched $string2 = "qwntfschrprtkjs"; // not matched (contains chr group) $regex = '/^(?= .*[bcdfghjklmnpqrstvwxz]{4} )(?!.*chr)/ix'; var_dump(preg_match($regex, $string1)); var_dump(preg_match($regex, $string2));
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
int(1) int(0)

preferences:
226.21 ms | 405 KiB | 349 Q