Function nom::sequence::separated_pair

pub fn separated_pair<I, O1, O2, O3, E: ParseError<I>, F, G, H>(
    first: F,
    sep: G,
    second: H,
) -> impl FnMut(I) -> IResult<I, (O1, O3), E>
where
    F: Parser<I, O1, E>,
    G: Parser<I, O2, E>,
    H: Parser<I, O3, E>,

Gets an object from the first parser, then matches an object from the sep_parser and discards it, then gets another object from the second parser.

Arguments

• first The first parser to apply.
• sep The separator parser to apply.
• second The second parser to apply.

use nom::sequence::separated_pair;
use nom::bytes::complete::tag;

let mut parser = separated_pair(tag("abc"), tag("|"), tag("efg"));

assert_eq!(parser("abc|efg"), Ok(("", ("abc", "efg"))));
assert_eq!(parser("abc|efghij"), Ok(("hij", ("abc", "efg"))));
assert_eq!(parser(""), Err(Err::Error(("", ErrorKind::Tag))));
assert_eq!(parser("123"), Err(Err::Error(("123", ErrorKind::Tag))));