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  1. import java.util.function.*;
  2.  
  3. class Ideone {
  4. 	static Predicate<String> isPalindrome = 
  5. 	  s->s.matches("|(?:(.)(?<=(?=^.*?(\\1\\2?)$).*))+(?<=(?=^\\2$).*)")//)")*.)$2\\^=?(=<?(+))*.)$)?2\\1\\(?*.^=?(=<?().(:?(|"(sehctam.s>-s
  6. 	  ;
  7.  
  8. 	public static void main (String[] args) throws java.lang.Exception {
  9. 		testPalindrome("", true);
  10. 		testPalindrome("x", true);
  11. 		testPalindrome("xx", true);
  12. 		testPalindrome("xy", false);
  13. 		testPalindrome("xyx", true);
  14. 		testPalindrome("xxx", true);
  15. 		testPalindrome("xxyx", false);
  16. 		testPalindrome("racecar", true);
  17. 		testPalindrome("step on no pets", true);
  18. 		testPalindrome("aManaPlanaCanalPanaMa", true);
  19. 		testPalindrome("this is impossible", false);
  20. 	}
  21.  
  22. 	static void testPalindrome(String s, boolean expected) {
  23. 		if (isPalindrome.test(s) == expected) {
  24. 			System.out.println("OK");
  25. 		} else {
  26. 			System.out.printf("NOK: str=\"%s\", expected=%b%n", s, expected);
  27. 		}
  28. 	}
  29. }
Success #stdin #stdout 0.08s 711680KB
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Standard input is empty
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OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
https://ideone.com/ZjdClm
language:
Java (12.0.1)
created:
7 years ago
visibility:
public

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