// 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"(?!^)(?<!\d[.A-Z])(?<!\d[A-Z]\.)\b(?=\d+(?:[a-zA-Z]|\.)\s+\p{Lu})").unwrap();
let string = "5. SCOPE This document outlines what to do in case of emergency landing (ignore for non-emergency landings) on tarmac. 6. WHEELS Never land on tarmac. Unless you have lowered the plane wheel mechanism. 6.1 Lower the wheel mechanism using the 2 Switches labelled 'wheel mechanism'. 7A WARNING 7A.1 Do not forget to warn passengers.
";
let substitution = "\\n-----------\\n";
// 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/