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  1. <?php
  2.  
  3. $line = "dsfsdf";
  4. if (!preg_match('/^[a-zA-Z0-9_-]{1,30}$/', $line))
  5. {
  6.    echo 'No Match found';
  7. }
  8. else
  9. {
  10.    echo 'Match found';
  11. }
Success #stdin #stdout 0.01s 82944KB
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Match found
https://ideone.com/T9hbjs
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
secret

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