From d3cc6dbaa09a1ad8396db068c3635bc18b7723d1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bart=C5=82omiej=20Dach?= <dach.bartlomiej@gmail.com>
Date: Mon, 18 Sep 2023 09:20:14 +0200
Subject: [PATCH] Fix link protocol allowlist allowing too much

---
 osu.Game/Online/Chat/MessageFormatter.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/osu.Game/Online/Chat/MessageFormatter.cs b/osu.Game/Online/Chat/MessageFormatter.cs
index db4d0b1363..667175117f 100644
--- a/osu.Game/Online/Chat/MessageFormatter.cs
+++ b/osu.Game/Online/Chat/MessageFormatter.cs
@@ -28,7 +28,7 @@ namespace osu.Game.Online.Chat
         //      http[s]://<domain>.<tld>[:port][/path][?query][#fragment]
         private static readonly Regex advanced_link_regex = new Regex(
             // protocol
-            @"(?<link>(https?|osu)[a-z]*?:\/\/" +
+            @"(?<link>(https?|osu(mp)?):\/\/" +
             // domain + tld
             @"(?<domain>(?:[a-z0-9]\.|[a-z0-9][a-z0-9-]*[a-z0-9]\.)*[a-z0-9-]*[a-z0-9]" +
             // port (optional)