fixed regex, now accepts formats with number on them

src/main.rs

@@ -60,7 +60,7 @@ fn extract_urls(html: &str) -> Vec<String> {
 }
 
 fn extract_img_url(html: &str) -> String {
-    let re = Regex::new(r"https://us\.rule34\.xxx//([A-Za-z0-9]+(/[A-Za-z0-9]+)+)\.[A-Za-z]+\?[0-9]+").unwrap();
+    let re = Regex::new(r"https://us\.rule34\.xxx//([A-Za-z0-9]+(/[A-Za-z0-9]+)+)\.[A-Za-z0-9]+\?[0-9]+").unwrap();
     match re.find(html) {
         Some(img_url) => img_url.as_str().to_string(),
         None => String::new(),