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  1. <?php
  2.  
  3. $string = "user is ?user_id=34&first_name=Ralph so is ?user_id=1 also";
  4. $result = preg_replace('/\?(user)_id=(\d+)(.*?)(?! )/i', '/$1/$2/$3', $string );
  5.  
  6. echo $result ;
Success #stdin #stdout 0.02s 24192KB
comments (?)
stdin 
Standard input is empty
stdout 
user is /user/34/&first_name=Ralph so is /user/1/ also
https://ideone.com/j9m5pj
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
secret

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