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  1. import java.util.regex.Pattern;
  2.  
  3. class Example {
  4. 	public static void main (String[] args) throws java.lang.Exception {
  5. 		check("aaaa", true);
  6. 		check("a", true);
  7. 		check("", true);
  8. 		check("m", true);
  9. 		check("n", true);
  10. 		check("mn", false);
  11. 		check("q", false);
  12. 		check("nnnn", false);
  13. 	}
  14. 	private static void check(String text, boolean expect) {
  15. 		boolean result = Pattern.matches("a*|[mn]", text);
  16. 		System.out.println(
  17. 			(result ? "Match   " : "No match") +
  18. 			(result == expect ? " OK    " : " ERROR ") +
  19. 			": " + text
  20. 		);
  21. 	}
  22. }
Success #stdin #stdout 0.14s 37692KB
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stdin
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Standard input is empty
stdout
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Match    OK    : aaaa
Match    OK    : a
Match    OK    : 
Match    OK    : m
Match    OK    : n
No match OK    : mn
No match OK    : q
No match OK    : nnnn
https://ideone.com/vvEYqf
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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