fork(3) download
  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.util.regex.*;
  5. import java.lang.*;
  6. import java.io.*;
  7.  
  8. /* Name of the class has to be "Main" only if the class is public. */
  9. class Ideone
  10. {
  11. public static void main (String[] args) throws java.lang.Exception
  12. {
  13. Pattern p = Pattern.compile("^(dog)(?:[^c]|c[^a]|ca[^t])+(cat)?");
  14. for (String s : new String[] {"dog, cat", "dog, dog, cat", "dog, dog, dog", "dog, cut, cab, cat, meow"}) {
  15. Matcher m = p.matcher(s);
  16. if (m.find()) {
  17. System.out.println(m.group(1)+" "+m.group(2));
  18. }
  19. }
  20. }
  21. }
Success #stdin #stdout 0.09s 320320KB
stdin
Standard input is empty
stdout
dog cat
dog cat
dog null
dog cat