Function combine::regex::find

pub fn find<R, I>(regex: R) -> Find<R, I> where
    R: Regex<I::Range>,
    I: FullRangeStream,
    I::Range: Range, 

Matches regex on the input by running find on the input and returns the first match. Consumes all input up until the end of the first match.

extern crate regex;
extern crate combine;
use regex::Regex;
use combine::Parser;
use combine::regex::find;

fn main() {
    let mut digits = find(Regex::new("^[0-9]+").unwrap());
    assert_eq!(digits.parse("123 456 "), Ok(("123", " 456 ")));
    assert!(
        digits.parse("abc 123 456 ").is_err());

    let mut digits2 = find(Regex::new("[0-9]+").unwrap());
    assert_eq!(digits2.parse("123 456 "), Ok(("123", " 456 ")));
    assert_eq!(digits2.parse("abc 123 456 "), Ok(("123", " 456 ")));
}