// 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"(?ms)(xyz(?:(?!abc).)*?)123").unwrap();
let string = "abc----1
pqr----2
123----3
xyz----4
lll----5
pqr----6
123----7
qqq----8
xyz----5
abc----3
123----9";
let substitution = "$1456";
// 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/