finding repeated characters in a row (3 times or more) in a string

Here is the code for finding repeated character like A in AAbbbc

String stringToMatch = "abccdef";
    Pattern p = Pattern.compile("((\\w)\\2+)+");
    Matcher m = p.matcher(tweet);
    while (m.find())
    {
       System.out.println("Duplicate character " + m.group(0));
    }

Now the problem is that I want to find the characters that are repeated but 3 times or more in a row, when I change 2 to 3 in the above code it does not work, Can anyone help?