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  1. <?php
  2.  
  3. $str = 'test, test, test2, test2, test3';
  4. echo preg_replace('/\b(\w+),\s+\1\b/', '$1', $str);
Success #stdin #stdout 0.01s 82624KB
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stdin
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Standard input is empty
stdout
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test, test2, test3
https://ideone.com/MUBwrP
language:
PHP (php 7.3.5)
created:
5 years ago
visibility:
public

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