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  1. <?php
  2.  
  3. $re = '/\\\\(\\\\)|\\\\./s';
  4. $str = 'ab\\xy ab\\\\xy ab\\\\\\xy';
  5. echo $result = preg_replace($re, '$1', $str);
  6.  
Success #stdin #stdout 0.01s 82944KB
comments (?)
stdin 
Standard input is empty
stdout 
aby ab\xy ab\y
https://ideone.com/MF4oXN
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
secret

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