pub fn tag<T, Input, Error: ParseError<Input>>(
tag: T
) -> impl Fn(Input) -> IResult<Input, Input, Error> where
Input: InputTake + InputLength + 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.
Example
use nom::bytes::streaming::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("S"), Err(Err::Error(Error::new("S", ErrorKind::Tag))));
assert_eq!(parser("H"), Err(Err::Incomplete(Needed::new(4))));