3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php echo preg_replace('^[^\d]$','', '3023');
Output for 4.3.11 - 7.2.0
Warning: preg_replace(): Unknown modifier '\' in /in/rgehd on line 2
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '\' in /in/rgehd on line 2