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, '/', $str);
based on OkhfE
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
http://asak.pl/asdas/asdad/asd.pdf