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  1. <?php
  2.  
  3.     $s ='<number>1<number>2</number>3</number>'; 
  4.     echo preg_replace('#<number>(\d+)<number>\d+</number>(\d+)</number>#', "$1 5 $2", $s);
  5.  
  6. ?>
Success #stdin #stdout 0.03s 13064KB
comments (?)
stdin 
Standard input is empty
stdout 
1 5 3
https://ideone.com/6W7qx
language:
PHP (php 7.3.5)
created:
12 years ago
visibility:
public

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