// 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#"(?<=class=")\s?btn(?=\s?(?:btn-)?(?:mini|small|large)?\s?")"#).unwrap();
let string = "<button class=\"btn btn-mini\" />
<button class=\"btn btn-small\" />
<button class=\"btn btn-large\"/>
<button class=\"btn\"/>
<button class=\"btn \"/>
<button class=\" btn\"/>
<button class=\"btn btn-mini btn-primary\" />
<button class=\"btn btn-small btn-success\" />
<button class=\"btn btn-large btn-info\"/>
<button class=\"btn btn-error\"/>";
// 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/