// 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)(https://)?discord\.gg/[a-zA-Z0-9]+").unwrap();
  let string = "discord.gg/advertisement";
  
  // result will be an iterator over tuples containing the start and end indices for each match in the string
  let result = regex.captures_iter(string);
  
  for mat in result {
    println!("{:?}", mat);
  }
}
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/