3v4l.org

run code in 200+ 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 - 7.2.0
http://asak.pl/asdas/asdad/asd.pdf