Add IPv6 URL pattern support with comprehensive test cases

- Add IPv6 URL pattern matching to support URLs like http://[::]:8000/
- Separate IPv6 URL pattern from main regex for better maintainability
- Add extensive test cases covering:
  - Basic IPv6 URLs with ports
  - URLs with paths and query parameters
  - Compressed IPv6 forms
  - Link-local and multicast addresses
  - Mixed scenarios and markdown contexts

src/config/url.zig

@@ -24,12 +24,18 @@ const oni = @import("oniguruma");
 /// handling them well requires a non-regex approach.
 pub const regex =
     "(?:" ++ url_schemes ++
-    \\)(?:[\w\-.~:/?#@!$&*+,;=%]+(?:[\(\[]\w*[\)\]])?)+(?<![,.])|(?:\.\.\/|\.\/*|\/)[\w\-.~:\/?#@!$&*+,;=%]+(?:\/[\w\-.~:\/?#@!$&*+,;=%]*)*
+    \\)(?:
+++ ipv6_url_pattern ++
+    \\|[\w\-.~:/?#@!$&*+,;=%]+(?:[\(\[]\w*[\)\]])?)+(?<![,.])|(?:\.\.\/|\.\/*|\/)[\w\-.~:\/?#@!$&*+,;=%]+(?:\/[\w\-.~:\/?#@!$&*+,;=%]*)*
 ;
 const url_schemes =
     \\https?://|mailto:|ftp://|file:|ssh:|git://|ssh://|tel:|magnet:|ipfs://|ipns://|gemini://|gopher://|news:
 ;
 
+const ipv6_url_pattern =
+    \\(?:\[[:0-9a-fA-F]+(?:[:0-9a-fA-F]*)+\](?::[0-9]+)?)
+;
+
 test "url regex" {
     const testing = std.testing;
 
@@ -194,6 +200,55 @@ test "url regex" {
             .input = "[link](/home/user/ghostty.user/example)",
             .expect = "/home/user/ghostty.user/example",
         },
+        // IPv6 URL tests - Basic tests
+        .{
+            .input = "Serving HTTP on :: port 8000 (http://[::]:8000/)",
+            .expect = "http://[::]:8000/",
+        },
+        .{
+            .input = "IPv6 address https://[2001:db8::1]:8080/path",
+            .expect = "https://[2001:db8::1]:8080/path",
+        },
+        .{
+            .input = "IPv6 localhost http://[::1]:3000",
+            .expect = "http://[::1]:3000",
+        },
+        .{
+            .input = "Complex IPv6 https://[2001:db8:85a3:8d3:1319:8a2e:370:7348]:443/",
+            .expect = "https://[2001:db8:85a3:8d3:1319:8a2e:370:7348]:443/",
+        },
+        // IPv6 URL tests - URLs with paths and query parameters
+        .{
+            .input = "IPv6 with path https://[2001:db8::1]/path/to/resource",
+            .expect = "https://[2001:db8::1]/path/to/resource",
+        },
+        .{
+            .input = "IPv6 with query https://[2001:db8::1]:8080/api?param=value&other=123",
+            .expect = "https://[2001:db8::1]:8080/api?param=value&other=123",
+        },
+        // IPv6 URL tests - Compressed forms
+        .{
+            .input = "IPv6 compressed http://[2001:db8::]:80/",
+            .expect = "http://[2001:db8::]:80/",
+        },
+        .{
+            .input = "IPv6 multiple zeros http://[2001:0:0:0:0:0:0:1]",
+            .expect = "http://[2001:0:0:0:0:0:0:1]",
+        },
+        // IPv6 URL tests - Special cases
+        .{
+            .input = "IPv6 link-local https://[fe80::1234:5678:9abc]",
+            .expect = "https://[fe80::1234:5678:9abc]",
+        },
+        .{
+            .input = "IPv6 multicast http://[ff02::1]/stream",
+            .expect = "http://[ff02::1]/stream",
+        },
+        // IPv6 URL tests - Mixed scenarios
+        .{
+            .input = "IPv6 in markdown [link](http://[2001:db8::1]/docs)",
+            .expect = "http://[2001:db8::1]/docs",
+        },
     };
 
     for (cases) |case| {