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  1. <?php
  2.  
  3. $re = '/(?<!\w)stackoverflow=""(?!\w)/'; 
  4. $str = ",stackoverflow=\"\" xxx\nxxx stackoverflow=\"\" xxx\nxxx stackoverflow=\"\"\nstackoverflow=\"\" xxx"; 
  5. echo preg_replace($re, "NEW=\"\"", $str);
Success #stdin #stdout 0.03s 52480KB
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,NEW="" xxx
xxx NEW="" xxx
xxx NEW=""
NEW="" xxx
https://ideone.com/6iHeOR
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
secret

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