// include the latest version of the regex crate in your Cargo.toml
extern crate regex;
use regex::Regex;
fn main() {
let regex = Regex::new(r"(?m)(?<=-)(?(?=\d{2})|(?'oneLetter'\d))(?=\D)").unwrap();
let string = "2020-7-3; blah.mp4
2022-08-03_blah.mp4
2013-04-03-20-34-08; blah.mp4";
let substitution = "0$oneLetter";
// result will be a String with the substituted value
let result = regex.replace_all(string, substitution);
println!("{}", result);
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Rust, please visit: https://docs.rs/regex/latest/regex/