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  1. <?php
  2.  
  3. $str = 'This is a number 100 but this isn\'t $100.';
  4. $re = '~\s*(?<!\$)\b\d+~';
  5. $subst = '!';
  6. $result = preg_replace($re, $subst, $str);
  7. echo $result;
Success #stdin #stdout 0s 52488KB
comments (?)
stdin 
Standard input is empty
stdout 
This is a number! but this isn't $100.
https://ideone.com/gq0UyG
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
secret

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