code: public static OffsetGroup fromMatchingCharAndEDT(int offset) {
      return from(CharOffset.asCharOffset(offset), EDTOffset.asEDTOffset(offset));
    }
docs: Creates an offset group using the same offset value as both the {@link
  com.bbn.bue.common.strings.offsets.CharOffset} and {@link com.bbn.bue.common.strings.offsets.EDTOffset}.
  This is for unit testing purposes and probably shouldn't be used in other code.