// 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"[^,.;!?]\K</h[1-6]>").unwrap();
let string = "<p>Today, not only we have so many breeds that are trained this and that.</p>
<h4><strong>We must add a dot after the closing strong</strong></h4>
<p>Hunting with your dog is a blah blah with each other.</p>
<h2>No need to change this one!</h2>
<p>Hunting with your dog is a blah blah with each other.</p>";
let substitution = ".$0";
// 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/