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  1. <?
  2. $RE=<<< HEREDOC
  3. ^
  4. (?:
  5.     [a-zA-Z0-9]{5}
  6.     (?(?=-[a-zA-Z0-9])-)
  7. ){5}
  8. \$
  9. HEREDOC;
  10. $text=file_get_contents("php://stdin");
  11. echo preg_match("/$RE/x", $text);
  12. ?>
Success #stdin #stdout 0.01s 20520KB
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https://ideone.com/1t81Im
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
secret

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