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  1. <?php
  2. $a = 'hello @user how are you';
  3. $b = 'RT @user how are you';
  4. $regex = '/(?<!RT)\s@([a-z0-9]{1,20})/i';
  5.  
  6. $aa = preg_match('/(?<!RT)\s@([a-z0-9]{1,20})/i', $a);
  7.  
  8. var_dump($aa);
  9.  
  10. $bb = preg_match('/(?<!RT)\s@([a-z0-9]{1,20})/i', $b);
  11.  
  12. var_dump($bb);
Success #stdin #stdout 0.02s 13112KB
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https://ideone.com/bOWbu
language:
PHP (php 7.3.5)
created:
13 years ago
visibility:
public

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