Function `digit1`

fn digit1<T, E: ParseError<T>>(input: T) -> crate::internal::IResult<T, T, E>
where
    T: Input,
    <T as Input>::Item: AsChar

Recognizes one or more ASCII numerical characters: 0-9

Streaming version: Will return Err(nom::Err::Incomplete(_)) if there's not enough input data, or if no terminating token is found (a non digit character).

Example

# use nom::{Err, error::ErrorKind, IResult, Needed};
# use nom::character::streaming::digit1;
assert_eq!(digit1::<_, (_, ErrorKind)>("21c"), Ok(("c", "21")));
assert_eq!(digit1::<_, (_, ErrorKind)>("c1"), Err(Err::Error(("c1", ErrorKind::Digit))));
assert_eq!(digit1::<_, (_, ErrorKind)>(""), Err(Err::Incomplete(Needed::new(1))));