Add sarcastic responses when someone says thanks or thank you

DeukBot4/MessageHandlers/JokeHandlers.cs

@@ -1,4 +1,6 @@
+using System;
 using System.Linq;
+using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 using DeukBot4.APIHandlers;
 using DeukBot4.Utilities;
@@ -67,5 +69,23 @@ namespace DeukBot4.MessageHandlers
 
         }
 
+        private static readonly Regex ThanksMatcher = new Regex(@"(?i)((\b)thanks*(\W|$)+)");
+        private static readonly string[] ThanksResponses = {
+            "You're welcome!", "No problem",
+            "It was the least I could do, I always do the least I can do!",
+            "Yes, well, we'd be absolutely nowhere without me.",
+            "Yeah no problem, I'm the only one who does work around here anyway",
+        };
+        private static readonly Random Rand = new Random();
+        public static async Task ThanksHandler(SocketMessage message)
+        {
+            var content = message.Content;
+            if (ThanksMatcher.IsMatch(content))
+            {
+                var response = ThanksResponses[Rand.Next(0, ThanksResponses.Length)];
+                message.Channel.SendMessageAsync(response);
+            }
+        }
+
     }
 }

DeukBot4/MessageHandlers/MainHandler.cs

@@ -25,6 +25,7 @@ namespace DeukBot4.MessageHandlers
                 ImageBackupHandler.Backup(message);
                 JokeHandlers.DeltaHandler(message);
                 JokeHandlers.DadJokeHandler(message);
+                JokeHandlers.ThanksHandler(message);
 #pragma warning restore 4014
             }
             catch (Exception e)