fork(1) download
  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6. import java.util.regex.*;
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. public static void main (String[] args) throws java.lang.Exception
  11. {
  12. String s = "Prooo\nJavaaa";
  13. Pattern pattern = Pattern.compile("\\b(?=Ja\\w*a\\b)\\w*?((\\w)\\2+)\\w*\\b");
  14. Matcher matcher = pattern.matcher(s);
  15. while (matcher.find()){
  16. System.out.println(matcher.group(1));
  17. }
  18. }
  19. }
Success #stdin #stdout 0.12s 320576KB
stdin
Standard input is empty
stdout
aaa