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  1. <?php
  2.  
  3.     $str = '5 this is 3';
  4.  
  5.     $replaced = preg_replace('~(?<=\s|^)\d(?=\D|$)~', '0\\0', $str);
  6.  
  7.     echo $replaced;
Success #stdin #stdout 0.01s 20568KB
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05 this is 03
https://ideone.com/3B7W0n
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
public

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