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  1. <?php
  2.  
  3. $s = 'Просто текст';
  4. $s = preg_replace('/^(.{3})./u', "$1\t", $s);
  5. echo $s;
Success #stdin #stdout 0.02s 24500KB
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Про	то текст
https://ideone.com/yagsbJ
language:
PHP (php 7.3.5)
created:
5 years ago
visibility:
public

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