3v4l.org

run code in 300+ PHP versions simultaneously
<?php $v = ""; var_dump(preg_match('/^[a-z]{2}(?:[\-_][A-Z]{2})?$/iu', $v));
Output for 7.1.25 - 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 - 8.1.30, 8.2.0 - 8.2.25, 8.3.0 - 8.3.13
int(0)

preferences:
68.97 ms | 407 KiB | 5 Q