{ZeroOrMore}} and C{L{OneOrMore}} expressions.

    Example::
        ident = Word(alphas)
        num = Word(nums)
        term = ident | num
        func = ident + Optional(delimitedList(term))
        print(func.parseString("fn a,b,100"))  # -> ['fn', 'a', 'b', '100']

        func = ident + Group(Optional(delimitedList(term)))
        print(func.parseString("fn a,b,100"))  # -> ['fn', ['a', 'b', '100']]
    c