// 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)(a)?b(?(1)c|d)").unwrap();
let string = "matches bd and abc. It does not match bc, but does match bd in abd. Let's see how this regular expression works on each of these four subject strings.
If-Then-Else Conditionals in Regular Expressions
http://www.regular-expressions.info/conditional.html";
let substitution = "\\1";
// 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/