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  1. <?php
  2.  
  3. $string = "123"; //or one of the other examples   
  4. if (preg_match("/(?<!\d)$string(?!\d)/", "123123",$matches)) {
  5.     echo "Matched!";
  6. } else {
  7. 	echo "Not matched!";
  8. }
Success #stdin #stdout 0.01s 52488KB
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stdin
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Standard input is empty
stdout
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Not matched!
https://ideone.com/elMItn
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
secret

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