Improve regexes & comment some code

RhinoReminds/ClientListener.cs

@@ -96,6 +96,14 @@ namespace RhinoReminds
 			}
 		}
 
+		public void SetAvatar(string avatarFilepath)
+		{
+			if (!client.Connected)
+				throw new InvalidOperationException("Error: The XMPP client isn't connected, so the avatar can't be updated.");
+
+			client.SetAvatar(avatarFilepath);
+		}
+
 		private void messageHandler(Message message)
 		{
 			if (!AllowedDomains.Contains("*") && !AllowedDomains.Contains(message.From.Domain)) {
@@ -185,12 +193,18 @@ namespace RhinoReminds
 						@"^me\s+",
 						@"^on\s+",
 						@"my",
+						@"you",
+						@"your",
+						@"&" // Ampersands cause a crash when sending!
 					}, new string[] {
 						" ",
 						"",
 						"",
 						"",
-						"your"
+						"your",
+						@"me",
+						@"my",
+						@"and"
 					}, RegexOptions.IgnoreCase).Trim();
 
 					sendChatReply(message, $"Ok! I'll remind you {reminder} at {dateTime}.");
@@ -205,6 +219,11 @@ namespace RhinoReminds
 			}
 		}
 
+		/// <summary>
+		/// Sends a chat message to the specified JID.
+		/// </summary>
+		/// <param name="to">The JID to send the message to.</param>
+		/// <param name="message">The messaage to send.</param>
 		private void sendChatMessage(Jid to, string message) {
 			//Console.WriteLine($"[Rhino/Send/Chat] Sending {message} -> {to}");
 			client.SendMessage(
@@ -212,6 +231,11 @@ namespace RhinoReminds
 				null, null, MessageType.Chat
 			);
 		}
+		/// <summary>
+		/// Sends a chat message in direct reply to a given incoming message.
+		/// </summary>
+		/// <param name="originalMessage">Original message.</param>
+		/// <param name="reply">Reply.</param>
 		private void sendChatReply(Message originalMessage, string reply)
 		{
 			//Console.WriteLine($"[Rhino/Send/Reply] Sending {reply} -> {originalMessage.From}");
@@ -272,10 +296,17 @@ namespace RhinoReminds
 
 				Console.WriteLine($"[Rhino/Reminderd] Sending notification {nextReminder}");
 
+				try
+				{
 					sendChatMessage(
 						nextReminder.Jid,
 						$"Hello! You asked me to remind you {nextReminder.Message} at {nextReminder.Time}.".Trim().Replace(@"\s+", " ")
 					);
+				} catch (Exception error) {
+					Console.Error.WriteLine($"[Rhino/Reminderd] Caught error sending message to client: {error}");
+					Console.Error.WriteLine($"[Rhink/Reminderd] Offending reminder: {nextReminder}");
+					sendChatMessage(nextReminder.Jid, "Oops! I encountered an error sending you a reminder. Please contact my operator!");
+				}
 				if (nextWaitingTime.TotalMilliseconds < 0) {
 					sendChatMessage(
 						nextReminder.Jid,