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  1. <?php
  2.  
  3. $string = 'Você está bem? 123 # ! @ ...';
  4. echo preg_replace('/[^\w\s+$]/u', '_', $string);
Success #stdin #stdout 0.02s 52472KB
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Standard input is empty
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Você está bem_ 123 _ _ _ ___
https://ideone.com/wjPxv8
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
secret

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