// 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"(?m)(?:(?!\bCats\h+Dogs\b)\b\w+\h+\w+\h+)*?(?:^\h*|\b(?!Cats\b)\w+\h+)(Dogs)\b").unwrap();
let string = "My Dogs are happy
Dogs are humans best friend
This is invalid Cats Dogs
The Dogs and Cats and Dogs and Dogs
There are Dogs and Cats and Dogs and Cats Dogs
The TomCats Dogs are valid
Dogs Cats Dogs";
// result will be an iterator over tuples containing the start and end indices for each match in the string
let result = regex.captures_iter(string);
for mat in result {
println!("{:?}", mat);
}
}
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/