regexでmatchした箇所をハイライト表示させるためのサンプルコード(rust版)

main.rs

extern crate regex;

use regex::Regex; // 1.1.8

fn main() {
    let seperator = Regex::new(r"is a").unwrap();
    let splits: Vec<_> = seperator.split("this... is a, test").into_iter().collect();
    for split in splits {
        println!("\"{}\"", split);
    }

    // let cap = seperator.captures("this... is a, test");
    // println!("{}", cap.);

    let re = Regex::new(r"[a-z]+(?:([0-9]+)|([A-Z]+))").unwrap();
    let caps = re.captures("abc123").unwrap();

    let text1 = caps.get(1).map_or("", |m| m.as_str());
    let text2 = caps.get(2).map_or("", |m| m.as_str());
    let text3 = caps.get(3).map_or("", |m| m.as_str());

    println!("text1: {}", text1);
    println!("text2: {}", text2);
    println!("text3: {}", text3);

    let pattern = Regex::new(r"rot").unwrap();
    let s = "swap drop rot number(3) \"item list\" xget 'item count'";
    let matches: Vec<String> = pattern
        .find_iter(s)
        .map(|m| m.as_str().to_string())
        .collect();
    println!("Matches: {}\n  - {}", matches.len(), matches.join("\n  - "));

    let mut text = "".to_string();
    let mut last_match: usize = 0;
    for m in pattern.find_iter(s) {
        let start: usize = m.start();
        let end: usize = m.end();

        let before_range_text = &s[last_match..start];
        let range_text = &s[start..end];

        text += before_range_text;
        text += &"____".to_string();
        text += range_text;
        text += &"____".to_string();
        last_match = end;
    }
    text += &s[last_match..];

    println!("text: {}", text);
}