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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4. import java.util.regex.*;
  5.  
  6. class Ideone
  7. {
  8. public static void main (String[] args) throws java.lang.Exception
  9. {
  10. String s = "su,sa,we";
  11. String day = "fr|sa|su|mo|tu|we|th";
  12. String pattern = "(?!.*\\b([a-z]{2})\\b.*\\b\\1\\b)(?:" + day + ")?(?:,(?:" + day + ")){0,5}";
  13. if (s.matches(pattern)) {
  14. System.out.println("Valid!");
  15. } else {
  16. System.out.println("Invalid!");
  17. }
  18. }
  19. }
Success #stdin #stdout 0.13s 37476KB
stdin
Standard input is empty
stdout
Valid!