3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $str = 'http://asak.pl/asdask//asdadk//asd.pdf'; $regexp = '//([^:]\/)\/+/'; echo preg_replace($regexp, '\1', $str);
based on YjHS7
Output for 4.3.11 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_replace(): Unknown modifier '(' in /in/40LMo on line 5
Output for hhvm-3.10.0 - 3.12.0
Warning: Unknown modifier '(': [//([^:]\/)\/+/] in /in/40LMo on line 5
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '(' in /in/40LMo on line 5