3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php echo preg_match('\\u', "سلام");
based on KfjjS
Output for 5.6.0 - 5.6.30, 7.0.0 - 7.3.0rc3
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/7A6qI on line 3
Output for hhvm-3.15.4
Warning: Delimiter must not be alphanumeric or backslash in /in/7A6qI on line 3