// 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"(?:\G(?!\A)|\[)[^]\s]*\K\s+").unwrap();
let string = "[Edit the] Expression & [Text to see matches]. Roll [over matches or the] expression for details. Undo mistakes with ctrl-z. [Save Favorites and Share expressions with friends] or the Community. Explore your results with Tools. [A full Reference and Help is available in the Library or watch the video Tutorial].";
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/