pub fn hexdig<I, E>(input: I) -> IResult<I, char, E>where
I: InputLength + InputIter + Slice<RangeFrom<usize>> + Clone,
<I as InputIter>::Item: AsChar,
E: ParseError<I>,Expand description
HEXDIG = DIGIT / “A” / “B” / “C” / “D” / “E” / “F”