Preliminary work on tiktok url regex

Program.cs

@@ -1,6 +1,12 @@
 using Microsoft.Extensions.Configuration;
 using System;
+using System.Web;
+using System.Text.RegularExpressions;
 using Telegram.Bot;
+using Telegram.Bot.Exceptions;
+using Telegram.Bot.Polling;
+using Telegram.Bot.Types;
+using Telegram.Bot.Types.Enums;
 
 namespace TeleTok
 {
@@ -16,10 +22,72 @@ namespace TeleTok
             var token = config.GetSection("TeleTokConf:token").Value;
 
             var botClient = new TelegramBotClient(token);
+            using var cts = new CancellationTokenSource();
+
+            // StartReceiving does not block the caller thread. Receiving is done on the ThreadPool.
+            ReceiverOptions receiverOptions = new ()
+            {
+                AllowedUpdates = Array.Empty<UpdateType>() // receive all update types
+            };
+
+            // HandleUpdateAsync and HandlePollingErrorAsync no worky Tyler help
+            botClient.StartReceiving(
+                updateHandler: HandleUpdateAsync,
+                pollingErrorHandler: HandlePollingErrorAsync,
+                receiverOptions: receiverOptions,
+                cancellationToken: cts.Token
+            );
+
             
             var me = await botClient.GetMeAsync();
 
-            Console.WriteLine($"Hello world! I am user {me.Id} and my name is {me.FirstName}.");
+            Console.WriteLine($"Start listening for @{me.Username}");
+            while (true)
+            {
+                // Do nothing until the stuff happens
+            }
+
+            cts.Cancel();
+        }
+
+        async Task HandleUpdateAsync(ITelegramBotClient botClient, Update update, CancellationToken cancellationToken)
+        {
+            // Only process Message updates: https://core.telegram.org/bots/api#message
+            if (update.Message is not { } message)
+                return;
+            // Only process text messages
+            if (message.Text is not { } messageText)
+                return;
+
+            var chatId = message.Chat.Id;
+
+            bool isUri = Uri.IsWellFormedUriString(message.ToString(), UriKind.RelativeOrAbsolute);
+
+            if (isUri)
+            {
+                Regex isTikTok = new Regex(@"(?x)(http(s)?:\/\/)?(?:www|m)\.(?:tiktok.com)\/(?:v|embed|trending)(?:\/)?(?:\?shareId=)?(?P<id>[\da-z]+)", RegexOptions.Singleline);
+            }
+
+            Console.WriteLine($"Received a '{messageText}' message in chat {chatId}.");
+
+            // Echo received message text
+            Message sentMessage = await botClient.SendTextMessageAsync(
+                chatId: chatId,
+                text: "You said:\n" + messageText,
+                cancellationToken: cancellationToken);
+        }
+
+        Task HandlePollingErrorAsync(ITelegramBotClient botClient, Exception exception, CancellationToken cancellationToken)
+        {
+            var ErrorMessage = exception switch
+            {
+                ApiRequestException apiRequestException
+                    => $"Telegram API Error:\n[{apiRequestException.ErrorCode}]\n{apiRequestException.Message}",
+                _ => exception.ToString()
+            };
+
+            Console.WriteLine(ErrorMessage);
+            return Task.CompletedTask;
         }
     }
 }

VidDownload.cs

@@ -0,0 +1,10 @@
+using System;
+using System.Diagnostics;
+
+namespace TeleTok
+{
+    public class VidDownload
+    {
+        
+    }
+}