Merge pull request #3463 from lightpanda-io/adblock-regex-pcre2

`AdBlocker`: run /regex/ filters with PCRE2

src/network/HttpClient.zig

@@ -4390,12 +4390,27 @@ test "HttpClient: adblock verdicts apply per request" {
         \\||typed.example.com^$script
         \\||partied.example.com^$third-party
         \\||framed.example.com^$subdocument
+        \\/\/[a-z]{4}\.js$/$match-case,script
     );
     try blocker.parse(&list);
     try blocker.build();
     client.network.adblocker = blocker;
     defer client.network.adblocker = null;
 
+    // A regex filter reads the URL as requested: case kept, fragment gone.
+    try testing.expect(testIsUrlBlocked(&client, .{
+        .url = "https://cdn.example.com/abcd.js",
+        .resource_type = .script,
+    }));
+    try testing.expect(testIsUrlBlocked(&client, .{
+        .url = "https://cdn.example.com/abcd.js#v2",
+        .resource_type = .script,
+    }));
+    try testing.expect(!testIsUrlBlocked(&client, .{
+        .url = "https://cdn.example.com/ABCD.js",
+        .resource_type = .script,
+    }));
+
     try testing.expect(testIsUrlBlocked(&client, .{ .url = "https://ads.example.com/pixel.gif" }));
     // Hostnames are matched case-insensitively and without the port.
     try testing.expect(testIsUrlBlocked(&client, .{ .url = "https://SUB.ADS.EXAMPLE.COM:8443/x" }));