Fix for dad joke handler with double I'm

DeukBot4/MessageHandlers/JokeHandling/DadJoke.cs

@@ -9,7 +9,8 @@ namespace DeukBot4.MessageHandlers.JokeHandling
         public string Id => "dad";
         public string Name => "Hi I'm dad";
 
-        private readonly Regex _regex = new Regex(@"(\s|^)i(`|’|'| a)?m (?<word>.{3,15})$",
+        private readonly Regex _regex = new Regex(
+            @"(\s|^)i(`|’|'| a)?m (?<word>((?!(i(`|’|'| a)?m)).){3,15})$",
             RegexOptions.IgnoreCase | RegexOptions.CultureInvariant);
 
         public async Task Run(ReceivedMessage message)