code: public static String getRowKeyUIDRegex(final List<byte[]> group_bys, 
        final ByteMap<byte[][]> row_key_literals) {
      return getRowKeyUIDRegex(group_bys, row_key_literals, false, null, null);
    }
docs: Crafts a regular expression for scanning over data table rows and filtering
  time series that the user doesn't want. At least one of the parameters
  must be set and have values.
  NOTE: This method will sort the group bys.
  @param group_bys An optional list of tag keys that we want to group on. May
  be null.
  @param row_key_literals An optional list of key value pairs to filter on.
  May be null.
  @return A regular expression string to pass to the storage layer.