fork(4) download 
  1. <?php
  2. $mystring = "(123*1.23*(0.12/8))*(123*512+40)";
  3. $regex="~\((?:[^()]++|(?R))*\)~";
  4. $replaced = preg_replace_callback($regex,
  5.            function($m) { return str_replace("*","||",$m[0]);},
  6.            $mystring);
  7. echo $replaced;
  8.  
Success #stdin #stdout 0.01s 20568KB
comments (?)
stdin 
Standard input is empty
stdout 
(123||1.23||(0.12/8))*(123||512+40)
https://ideone.com/AEVtSO
language:
PHP (php 7.3.5)
created:
9 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!