pub fn tag<T, Input, Error: ParseError<Input>>(
tag: T
) -> impl Fn(Input) -> IResult<Input, Input, Error> where
Input: InputTake + Compare<T>,
T: InputLength + Clone,
Expand description
Recognizes a pattern
The input data will be compared to the tag combinator’s argument and will return the part of the input that matches the argument
It will return Err(Err::Error((_, ErrorKind::Tag)))
if the input doesn’t match the pattern
Example
use nom::bytes::complete::tag;
fn parser(s: &str) -> IResult<&str, &str> {
tag("Hello")(s)
}
assert_eq!(parser("Hello, World!"), Ok((", World!", "Hello")));
assert_eq!(parser("Something"), Err(Err::Error(Error::new("Something", ErrorKind::Tag))));
assert_eq!(parser(""), Err(Err::Error(Error::new("", ErrorKind::Tag))));