3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $str = "0"; echo preg_match('/^\S/$', $str);
based on Uer3n
Output for 4.3.11 - 7.1.0
Warning: preg_match(): Unknown modifier '$' in /in/LjNZX on line 5
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '$' in /in/LjNZX on line 5