import telebot
import re

TOKEN = 'YOUR_TOKEN'
bot = telebot.TeleBot(TOKEN)
receiveReference = False
reference = ''
pattern = "((http|https)\:\/\/)?[a-zA-Z0-9\.\/\?\:@\-_=#]+\.([a-zA-Z]){2,6}([a-zA-Z0-9\.\&\/\?\:@\-_=#])*"

@bot.message_handler(commands=['start'])
def send_welcome(message):
	bot.reply_to(message, "Hello, I'm ready.")

@bot.message_handler(commands=['help'])
def send_help(message):
	bot.reply_to(message, "My commands are: /start, /help, /reference")

@bot.message_handler(commands=['reference'])
def send_question(message):
  global receiveReference
  receiveReference = True
  bot.reply_to(message, "tell me, what's your reference code?.")

@bot.message_handler()
def process_response(message):
  global receiveReference, reference
  if(len(reference) > 0):
    result = re.match(pattern, message.text)
    if(result):
      bot.delete_message(chat_id=message.chat.id, message_id=message.message_id)
  if(receiveReference):
    reference = message.text
    bot.reply_to(message, "OK, your reference is: %s, send me now any URL." % reference)
    receiveReference = False


try:
  print('[INFO] Bot started...')
  bot.polling()
except Exception as ex:
  print("Something goes wrong, exception: ", ex)