3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $str = 'http://asak.pl/asdask//asdadk//asd.pdf'; $regexp = '/[^:/]{2}(\/\/+)/'; echo preg_replace($regexp, '/', $str);
based on F61eN
Output for 4.3.11 - 7.1.0
Warning: preg_replace(): Unknown modifier ']' in /in/uflOP on line 5
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier ']' in /in/uflOP on line 5