3v4l.org

run code in 300+ PHP versions simultaneously
<?php $regex = '^(/|https?://)?'; var_dump(preg_match('/' . $regex . '/u', ''));
Output for 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Warning: preg_match(): Unknown modifier '|' in /in/hPCA3 on line 4 bool(false)
preferences:
45.22 ms | 406 KiB | 5 Q