use regex::Regex;
fn main() {
let str = String::from("java php go c python php phpphphp php java");
let word = "php";
let replacewith = "RUST";
let re = Regex::new(&format!("(?i){}", word)).unwrap();
let result = re.replace_all(&str, replacewith);
println!("{}", result);
}
/*
run:
java RUST go c python RUST RUSTRUSThp RUST java
*/