Function nom::bytes::complete::take_until

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

Returns the longest input slice till it matches 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::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(("hello, world", ErrorKind::TakeUntil))));
assert_eq!(until_eof(""), Err(Err::Error(("", ErrorKind::TakeUntil))));