Fix: Add wildcard (*) support for custom filters

src/filters/cosmetic.rs

@@ -188,6 +188,10 @@ impl CosmeticFilter {
                 hostname.len()
             };
             let location = &hostname[start..end];
+            // Skip wildcard (*) - it matches all domains
+            if location == "*" {
+                return None;
+            }
             // AdGuard regex syntax
             if location.starts_with('/') {
                 return Some((CosmeticFilterLocationType::Unsupported, part));

tests/unit/engine.rs

@@ -237,9 +237,9 @@ mod tests {
             );
         }
         let expected_hash: u64 = if cfg!(feature = "css-validation") {
-            7671576097086431151
+            9113803688770546221
         } else {
-            7220740598028920672
+            15343284834809453004
         };
 
         assert_eq!(hash(&data), expected_hash, "{HASH_MISMATCH_MSG}");

tests/unit/filters/cosmetic.rs

@@ -488,6 +488,53 @@ mod parse_tests {
         );
     }
 
+    #[test]
+    fn wildcard_support() {
+        // Wildcard for scriptlet injection (issue #582)
+        check_parse_result(
+            r#"*##+js(test-scriptlet.js)"#,
+            CosmeticFilterBreakdown {
+                selector: SelectorType::PlainCss(r#"test-scriptlet.js"#.to_string()),
+                script_inject: true,
+                ..Default::default()
+            },
+        );
+        check_parse_result(
+            r#"*##+js(test-scriptlet.js, arg1, arg2)"#,
+            CosmeticFilterBreakdown {
+                selector: SelectorType::PlainCss(r#"test-scriptlet.js, arg1, arg2"#.to_string()),
+                script_inject: true,
+                ..Default::default()
+            },
+        );
+        // Wildcard for regular cosmetic filters
+        check_parse_result(
+            r#"*##.ad-banner"#,
+            CosmeticFilterBreakdown {
+                selector: SelectorType::PlainCss(r#".ad-banner"#.to_string()),
+                ..Default::default()
+            },
+        );
+        // Wildcard combined with other domains
+        check_parse_result(
+            r#"*,example.com##.ad-banner"#,
+            CosmeticFilterBreakdown {
+                selector: SelectorType::PlainCss(r#".ad-banner"#.to_string()),
+                hostnames: sort_hash_domains(vec!["example.com"]),
+                ..Default::default()
+            },
+        );
+        check_parse_result(
+            r#"example.com,*##+js(test-scriptlet.js)"#,
+            CosmeticFilterBreakdown {
+                selector: SelectorType::PlainCss(r#"test-scriptlet.js"#.to_string()),
+                hostnames: sort_hash_domains(vec!["example.com"]),
+                script_inject: true,
+                ..Default::default()
+            },
+        );
+    }
+
     #[test]
     fn entities() {
         check_parse_result(