The Delimiter class will need to be used by other properties that aren't delimiters. For example, textStandardZeroRep is allowed to have DFDL character entities in it, so it could use this class for parsing, but it isn't a delimiter. We need to refactor this class to be a more general purpose class that converts strings into regular expressions that can parse strings.

While we're at it, It would probably be worth making it a little more functional and getting rid of the vars.