Function `many0_count`

fn many0_count<I, E, F>(parser: F) -> impl Parser<I, Output = usize, Error = E>
where
    I: Clone + Input,
    F: Parser<I, Error = E>,
    E: ParseError<I>

Repeats the embedded parser, counting the results

This stops on Err::Error. To instead chain an error up, see [cut][crate::combinator::cut].

Arguments

f The parser to apply.

Note: if the parser passed in accepts empty inputs (like alpha0 or digit0), many0 will return an error, to prevent going into an infinite loop

# use nom::{Err, error::ErrorKind, Needed, IResult, Parser};
use nom::multi::many0_count;
use nom::bytes::complete::tag;

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