Bettering my Rust

gistfile1.rs

// old one
fn process_stat(str: &str) -> Option<Vec<u32>> {
    match STAT_REGEX.captures(str) {
        Some(captures) => {
            let iter = captures.at(1).split(' ');
            let vec = iter.map(|x: &str| {
                from_str(x).unwrap()
            }).collect();
            Some(vec)
        }
        None => None
    }
}

// new one (also safer because there is no unwrap anymore)
fn process_stat(str: &str) -> Option<Vec<u32>> {
    STAT_REGEX.captures(str).and_then( |captures| {
        let iter = captures.at(1).split(' ');
        iter.map(from_str).collect()
    })
}