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  1. <?php
  2.  
  3. $str = 'hi s';
  4.  
  5. $s1 = 'hi';
  6. $s2 = 's';
  7.  
  8. $result = preg_replace('~' . preg_quote($s1) . '(?!' . preg_quote($s2) . ')~', 'replace with this', $str);
  9.  
  10. var_dump($result);
Success #stdin #stdout 0.02s 13112KB
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Standard input is empty
stdout
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string(19) "replace with this s"
https://ideone.com/U2JdkL
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
public

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