s for
    ``max`` and ``exact`` are 0, meaning no maximum or exact
    length restriction.

    Example::

        # define a comma-separated-value as anything that is not a ','
        csv_value = CharsNotIn(',')
        print(DelimitedList(csv_value).parse_string("dkls,lsdkjf,s12 34,@!#,213"))

    prints::

        ['dkls', 'lsdkjf', 's12 34', '@!#', '213']
    rn