pub fn many0<I, O, E, F>(f: 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 until it fails
and returns the results in a Vec
.
Arguments
f
The parser to apply.
Note: if the parser passed to many0
accepts empty inputs
(like alpha0
or digit0
), many0
will return an error,
to prevent going into an infinite loop
use nom::multi::many0;
use nom::bytes::complete::tag;
fn parser(s: &str) -> IResult<&str, Vec<&str>> {
many0(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![])));