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  1. <?php
  2. echo preg_replace('/(?:(?=(bar)))?/', '[[$1]]', "foobar");
  3.  
  4. ?>
Success #stdin #stdout 0.03s 13112KB
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[[]]f[[]]o[[]]o[[bar]]b[[]]a[[]]r[[]]
https://ideone.com/8Mjg6
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
public

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