Function take_until

pub fn take_until<T, Input, Error: ParseError<Input>>(
    tag: T,
) -> impl Fn(Input) -> IResult<Input, Input, Error>
where
    Input: InputTake + InputLength + FindSubstring<T>,
    T: Clone,

Returns the input slice up to the first occurrence of the pattern.

It doesn’t consume the pattern.

Streaming Specific

Streaming version will return a Err::Incomplete(Needed::new(N)) if the input doesn’t contain the pattern or if the input is smaller than the pattern.

Example

use nom::bytes::streaming::take_until;

fn until_eof(s: &str) -> IResult<&str, &str> {
  take_until("eof")(s)
}

assert_eq!(until_eof("hello, worldeof"), Ok(("eof", "hello, world")));
assert_eq!(until_eof("hello, world"), Err(Err::Incomplete(Needed::Unknown)));
assert_eq!(until_eof("hello, worldeo"), Err(Err::Incomplete(Needed::Unknown)));
assert_eq!(until_eof("1eof2eof"), Ok(("eof2eof", "1")));