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  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 = "aaaaaa";
  13. Matcher m = Pattern.compile("(?=(aa))").matcher(s);
  14. List<Integer> pos = new ArrayList<Integer>();
  15. while (m.find())
  16. {
  17. pos.add(m.start());
  18. }
  19. System.out.println(pos);
  20. }
  21. }
Success #stdin #stdout 0.09s 320576KB
stdin
Standard input is empty
stdout
[0, 1, 2, 3, 4]