3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php preg_match('/[.a.]/', '');
Output for 4.3.11 - 5.6.30, 7.0.0 - 7.3.0rc4
Warning: preg_match(): Compilation failed: POSIX collating elements are not supported at offset 0 in /in/pm0Ct on line 2
Output for 4.3.0 - 4.3.10, hhvm-3.10.1 - 3.17.3
Warning: Compilation failed: POSIX collating elements are not supported at offset 0 in /in/pm0Ct on line 2