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  1. <?php
  2.  
  3. $string = 'Hello "world". [start]this is a "mark"[end]. It should work with [start]"several" "marks"[end]';
  4. $regex = '/\[start](?:(?!\[(?:start|end)]).)*\[end]/s';
  5. $string = preg_replace_callback($regex, function($m) {
  6. 	return str_replace('"', '&quot;', $m[0]);
  7. },$string);
  8. echo $string;
Success #stdin #stdout 0.02s 52432KB
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Standard input is empty
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Hello "world". [start]this is a &quot;mark&quot;[end]. It should work with [start]&quot;several&quot; &quot;marks&quot;[end]
https://ideone.com/Ox3Weu
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
secret

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