Function nom::alpha0

pub fn alpha0<T>(input: T) -> IResult<T, T, u32> where
    T: Slice<Range<usize>> + Slice<RangeFrom<usize>> + Slice<RangeTo<usize>>,
    T: InputIter + InputLength + AtEof,
    <T as InputIter>::RawItem: AsChar, 

Recognizes zero or more lowercase and uppercase alphabetic characters: a-zA-Z