3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo preg_replace('^[^\d]$','', '3023');
Output for 4.3.11 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_replace(): Unknown modifier '\' in /in/rgehd on line 2
Output for hhvm-3.10.0 - 3.12.0
Warning: Unknown modifier '\': [^[^\d]$] in /in/rgehd on line 2
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '\' in /in/rgehd on line 2