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  1. <?php
  2.  
  3. $re = '~\bcat\b(?![-:])~'; 
  4. $str = "my cat is hungry all the time\nthe products cat-1547 and cat:154 are disponible now"; 
  5. $subst = "Felix"; 
  6. $result = preg_replace($re, $subst, $str);
  7. echo $result;
Success #stdin #stdout 0.04s 52480KB
comments (?)
stdin 
Standard input is empty
stdout 
my Felix is hungry all the time
the products cat-1547 and cat:154 are disponible now
https://ideone.com/ZVaQUh
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
secret

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