docs: public static String getUniqueId(String accessId, String realm) {
      
          if (realm != null) {
              Pattern pattern = Pattern.compile("([^:]+):(" + Pattern.quote(realm) + ")/(.*)");
              Matcher m = pattern.matcher(accessId);
              if (m.matches()) {
                  if (m.group(3).length() > 0) {
                      return m.group(3);
                  }
              }
          }
          // if there is no match, fall back.
          return getUniqueId(accessId);
      }