// 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)(^[\t\s]*)(forgot: "to",)(?!\n[\t\s]*insert: "something",)"#).unwrap();
let string = " oops: {
forgot: \"to\",
in: \"here\"
},";
let substitution = "\\1\\2\\n\\1insert: \"something\",";
// result will be a String with the substituted value
let result = regex.replace(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/