Function memoir::parsers::greediest

pub fn greediest<'a, O>(choices: impl AsRef<[Parser<O>]> + 'static) -> Parser<O> where
    O: 'static + Clone, 

Applies all the given parsers and picks the one which consumes the most input. Doesn’t consume any input on partial failure.

use memoir::*;

let p = greediest([string("he"), string("hello")]);

assert_eq!(p.parse("hello").ok(), Some(("hello".to_owned(), "")));
assert_eq!(p.parse("he").ok(), Some(("he".to_owned(), "")));