fork(1) download 
  1. <?php
  2.  
  3. $s = "test > >";
  4. echo preg_replace("/(?<!> )> >(?!\s*>)/",">>>>", $s);
Success #stdin #stdout 0.01s 82944KB
comments (?)
stdin 
Standard input is empty
stdout 
test >>>>
https://ideone.com/7FybkA
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
secret

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