pub fn digit1<T, E: ParseError<T>>(input: T) -> IResult<T, T, E>
Expand description
Recognizes one or more ASCII numerical characters: 0-9
Complete version: Will return an error if there’s not enough input data, or the whole input if no terminating token is found (a non digit character).
§Example
fn parser(input: &str) -> IResult<&str, &str> {
digit1(input)
}
assert_eq!(parser("21c"), Ok(("c", "21")));
assert_eq!(parser("c1"), Err(Err::Error(Error::new("c1", ErrorKind::Digit))));
assert_eq!(parser(""), Err(Err::Error(Error::new("", ErrorKind::Digit))));
§Parsing an integer
You can use digit1
in combination with map_res
to parse an integer:
fn parser(input: &str) -> IResult<&str, u32> {
map_res(digit1, str::parse)(input)
}
assert_eq!(parser("416"), Ok(("", 416)));
assert_eq!(parser("12b"), Ok(("b", 12)));
assert!(parser("b").is_err());