main.rs

#![feature(plugin)]
#![plugin(regex_macros)]

extern crate regex;

use std::ops::Index;
use regex::Regex;

pub struct Re(Regex);

impl Index<Re> for str {
    type Output = str;
    fn index<'b>(&'b self, index: &Re) -> &'b str {
        let (from, to) = index.0.find(self).unwrap();
        &self[from..to]
    }
}


fn main() {
    let m = &"abbccc"[Re(regex!("ab+"))];
    println!("{:?}", m);
}