// 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"(?:\b([a-z]++)\B|\G(?<!^))([A-Z][a-z]+|[a-z]+|[A-Z]+)").unwrap();
let string = "parsingHTTPorSomeURLrequestToday enhanceThisGold thisIsCOOL xP anotherACRONYMiTest loadedTHISupLIKEaMaDmAnS NoReplacement NONEok None none n ";
let substitution = "\\L$1_$2";
// 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/