// 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)^(?:.*?\K//){3}").unwrap();
let string = "ABC//DEG//IJK//LMN//OPQ//rstuvwxyz
BCA//EGD//JKI//MNL//PQO//stuvwxyzr
ACB//DGE//IJK//LNM//OQP//rstuvwxyz
ABC//DEG//IJK//LMN//OPQ//rstuvwxyz
CAB//GDE//KIJ//NLM//QOP//rstuvwxyz
BAC//EDG//JIK//MLN//POQ//rstuvwxyz";
let substitution = "\\\\\\\\";
// 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/