3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php preg_match('/[:a:]/', '');
Output for 4.3.11 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): Compilation failed: POSIX named classes are supported only within a class at offset 0 in /in/oEgEK on line 2
Output for 4.3.0 - 4.3.10, hhvm-3.10.0 - 3.13.2
Warning: Compilation failed: POSIX named classes are supported only within a class at offset 0 in /in/oEgEK on line 2