// 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"(?x)(?: # Non capturing group 1
\G # Matches where the regex engine stops in the previous step
(\w+) # capture group 1: a regex word of 1+ chars
\h* # zero or more horizontal spaces (space, tabs)
(?: # Non capturing group 2
=\h* # literal '=' follower by zero or more hspaces
(\w+) # capture group 2: a regex word of 1+ chars
)? # make the non capturing group 2 optional
)+ # repeat the non capturing group 1, one or more").unwrap();
let string = "Key name = value";
let substitution = "\\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/