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  1. <?php
  2.  
  3. function check($input) {
  4. 	return (bool)preg_match('/\A(?:[A-Z0-9]-?+(?!\z))*+[A-Z0-9]*+\z/', $input);
  5. }
  6.  
  7. var_dump(
  8.  
  9. 	// Trueと判定すべき
  10. 	check(''),
  11. 	check('ABC'),
  12. 	check('ABC-123'),
  13. 	check('ABC-DEF-123'),
  14.  
  15. 	// Falseと判定すべき
  16. 	check('ABC-DEF--123'),
  17. 	check('ABC-DEF-123-'),
  18. 	check('-A'),
  19. 	check('A-'),
  20. 	check('-A-'),
  21. 	check("ABC-123\n")
  22.  
  23. );
  24.  
  25.  
Success #stdin #stdout 0.01s 20520KB
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stdin
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Standard input is empty
stdout
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bool(true)
bool(true)
bool(true)
bool(true)
bool(false)
bool(false)
bool(false)
bool(false)
bool(false)
bool(false)
https://ideone.com/evX3Ie
language:
PHP (php 7.3.5)
created:
12 years ago
visibility:
public

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