3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo preg_replace('//^\D*(\d{1,4})\D*$//', '$1', 'sdf4443dfsdf');
Output for 4.3.11 - 7.1.0
Warning: preg_replace(): Unknown modifier '^' in /in/mRvFq on line 3
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '^' in /in/mRvFq on line 3