Function `take_until`

fn take_until<T, I, Error: ParseError<I>>(tag: T) -> impl FnMut(I) -> crate::internal::IResult<I, I, Error>
where
    I: Input + FindSubstring<T>,
    T: Input + Clone

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

It doesn't consume the pattern. It will return Err(Err::Error((_, ErrorKind::TakeUntil))) if the pattern wasn't met.

Example

# use nom::{Err, error::{Error, ErrorKind}, Needed, IResult};
use nom::bytes::complete::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::Error(Error::new("hello, world", ErrorKind::TakeUntil))));
assert_eq!(until_eof(""), Err(Err::Error(Error::new("", ErrorKind::TakeUntil))));
assert_eq!(until_eof("1eof2eof"), Ok(("eof2eof", "1")));