fork(1) download 
  1. <?php
  2.  
  3.  
  4. $re = '~(?<!/)/(?!/)~';
  5. $str = 'man_city/man_united
  6. liverpool///arsenal
  7. chelsea//spurs
  8. leicester/sunderland';
  9. $result = preg_replace($re, "\\/", $str);
  10. echo $result;
Success #stdin #stdout 0.01s 23764KB
comments (?)
stdin 
Standard input is empty
stdout 
man_city\/man_united
liverpool///arsenal
chelsea//spurs
leicester\/sunderland
https://ideone.com/ilKrLj
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!