// 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)(?:\G(?!^)|^(?=.*string3)).*?\Kstring1").unwrap();
let string = "This is line string1
This is line two with string1 and string3 string1
This is line two with string1 string1 and string3
This is line three with string3
This is line string3 with string1 and string1";
let substitution = "string2";
// 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/