nom::combinator

Function recognize

Source 
pub fn recognize<I: Clone + Offset + Input, E: ParseError<I>, F>(
    parser: F,
) -> impl Parser<I, Output = I, Error = E>
where
    F: Parser<I, Error = E>,
Expand description

If the child parser was successful, return the consumed input as produced value.

use nom::combinator::recognize;
use nom::character::complete::{char, alpha1};
use nom::sequence::separated_pair;

let mut parser = recognize(separated_pair(alpha1, char(','), alpha1));

assert_eq!(parser.parse("abcd,efgh"), Ok(("", "abcd,efgh")));
assert_eq!(parser.parse("abcd;"),Err(Err::Error((";", ErrorKind::Char))));