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  1. <?php
  2.  
  3. $s = '\\n \\t \\';
  4. $s = preg_replace('~\\\\(?!n)~', '', $s);
  5. echo $s;
Success #stdin #stdout 0.01s 52488KB
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stdin
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Standard input is empty
stdout
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\n t
https://ideone.com/RC0A6i
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
secret

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