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  1. <?php
  2.  
  3. $re = '~/mypar:[^/]*~'; 
  4. $str = "/pippo:2/mypar:asa/7pippo:1/";
  5. $result = preg_replace($re, '', $str, 1);
  6. echo $result;
Success #stdin #stdout 0.02s 52472KB
comments (?)
stdin 
Standard input is empty
stdout 
/pippo:2/7pippo:1/
https://ideone.com/PhYPA1
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
public

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