Function nom::multi::many0_count

pub fn many0_count<I, O, E, F>(f: F) -> impl Fn(I) -> IResult<I, usize, E> where
    I: Clone + PartialEq,
    F: Fn(I) -> IResult<I, O, E>,
    E: ParseError<I>, 

Repeats the embedded parser until it fails and returns the number of successful iterations.

Arguments

• f The parser to apply.

use nom::multi::many0_count;
use nom::bytes::complete::tag;

fn parser(s: &str) -> IResult<&str, usize> {
  many0_count(tag("abc"))(s)
}

assert_eq!(parser("abcabc"), Ok(("", 2)));
assert_eq!(parser("abc123"), Ok(("123", 1)));
assert_eq!(parser("123123"), Ok(("123123", 0)));
assert_eq!(parser(""), Ok(("", 0)));