3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump(preg_match('\{\}', '{}'));
based on 7ZpeK
Output for 4.3.11 - 5.6.21, 7.0.0 - 7.1.0RC5
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/bA9FX on line 3 bool(false)
Output for 4.3.0 - 4.3.10, hhvm-3.10.0 - 3.12.0
Warning: Delimiter must not be alphanumeric or backslash in /in/bA9FX on line 3 bool(false)