Demo Rust tool to test importing

index.rs

use regex::Regex;

fn main() {
    let phone_regex = Regex::new(r"\d{3}-(\d{3})-(\d{4})").unwrap();

    let phone_matches = phone_regex.captures("555-555-5555");

    return match phone_matches
        .map(|caps| {
            (
                caps.get(1).map(|m| m.as_str()),
                caps.get(2).map(|m| m.as_str()),
            )
        })
        .and_then(|(first_opt, second_opt)| match (first_opt, second_opt) {
            (Some(first), Some(second)) => Some((first, second)),
            _ => None,
        }) {
        Some((first, second)) => {
            println!("{}/{}", first, second);
        }
        _ => {}
    };
}