pub fn many_m_n<I, O, E, F>(
min: usize,
max: usize,
parse: F
) -> impl FnMut(I) -> IResult<I, Vec<O>, E> where
I: Clone + InputLength,
F: Parser<I, O, E>,
E: ParseError<I>,
Expand description
Repeats the embedded parser n
times or until it fails
and returns the results in a Vec
. Fails if the
embedded parser does not succeed at least m
times.
Arguments
m
The minimum number of iterations.n
The maximum number of iterations.f
The parser to apply.
use nom::multi::many_m_n;
use nom::bytes::complete::tag;
fn parser(s: &str) -> IResult<&str, Vec<&str>> {
many_m_n(0, 2, tag("abc"))(s)
}
assert_eq!(parser("abcabc"), Ok(("", vec!["abc", "abc"])));
assert_eq!(parser("abc123"), Ok(("123", vec!["abc"])));
assert_eq!(parser("123123"), Ok(("123123", vec![])));
assert_eq!(parser(""), Ok(("", vec![])));
assert_eq!(parser("abcabcabc"), Ok(("abc", vec!["abc", "abc"])));