main: strip nix store paths

the paths we match with regex are always prefixed
with /nix/store/<...>-, which amounts to 44 chars.
Since this is always the same, we can just strip
these 44 chars before matching with regex.

This reduces both complexity of the regex and performance.

src/main.rs

@@ -254,7 +254,7 @@ fn main() {
 fn store_path_regex() -> &'static Regex {
     static REGEX: OnceLock<Regex> = OnceLock::new();
     REGEX.get_or_init(|| {
-        Regex::new(r"^/nix/store/[a-z0-9]+-(.+?)-([0-9].*?)$")
+        Regex::new(r"(.+?)-([0-9].*?)$")
             .expect("Failed to compile regex pattern for nix store paths")
     })
 }
@@ -263,8 +263,14 @@ fn store_path_regex() -> &'static Regex {
 fn get_version<'a>(pack: impl Into<&'a str>) -> Result<(&'a str, &'a str)> {
     let path = pack.into();
 
+    // We can strip the path since it _always_ starts with
+    // /nix/store/....-
+    // This part is exactly 44 chars long, so we just remove it.
+    let stripped_path = &path[44..];
+    debug!("Stripped path: {stripped_path}");
+
     // Match the regex against the input
-    if let Some(cap) = store_path_regex().captures(path) {
+    if let Some(cap) = store_path_regex().captures(stripped_path) {
         // Handle potential missing captures safely
         let name = cap.get(1).map_or("", |m| m.as_str());
         let version = cap.get(2).map_or("", |m| m.as_str());