diff --git a/telebot/util.py b/telebot/util.py
index 21826d0..31d2d35 100644
--- a/telebot/util.py
+++ b/telebot/util.py
@@ -244,7 +244,7 @@ def extract_arguments(text):
     :param text: String to extract the arguments from a command
     :return: the arguments if `text` is a command (according to is_command), else None.
     """
-    regexp = re.compile("/\w*(@\w*)*\s*([\s\S]*)",re.IGNORECASE)
+    regexp = re.compile(r"/\w*(@\w*)*\s*([\s\S]*)",re.IGNORECASE)
     result = regexp.match(text)
     return result.group(2) if is_command(text) else None
 
diff --git a/tests/test_telebot.py b/tests/test_telebot.py
index 101061f..5d324dd 100644
--- a/tests/test_telebot.py
+++ b/tests/test_telebot.py
@@ -48,7 +48,7 @@ class TestTeleBot:
         bot = telebot.TeleBot('')
         msg = self.create_text_message(r'https://web.telegram.org/')
 
-        @bot.message_handler(regexp='((https?):((//)|(\\\\))+([\w\d:#@%/;$()~_?\+-=\\\.&](#!)?)*)')
+        @bot.message_handler(regexp=r'((https?):((//)|(\\\\))+([\w\d:#@%/;$()~_?\+-=\\\.&](#!)?)*)')
         def command_url(message):
             msg.text = 'got'
 
@@ -84,7 +84,7 @@ class TestTeleBot:
         bot = telebot.TeleBot('')
         msg = self.create_text_message(r'web.telegram.org/')
 
-        @bot.message_handler(regexp='((https?):((//)|(\\\\))+([\w\d:#@%/;$()~_?\+-=\\\.&](#!)?)*)')
+        @bot.message_handler(regexp=r'((https?):((//)|(\\\\))+([\w\d:#@%/;$()~_?\+-=\\\.&](#!)?)*)')
         def command_url(message):
             msg.text = 'got'