docs: def extract_arguments(text):
      """
      Returns the argument after the command.
      
      Examples:
      extract_arguments("/get name"): 'name'
      extract_arguments("/get"): ''
      extract_arguments("/get@botName name"): 'name'
      
      :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)
      result = regexp.match(text)
      return result.group(2) if is_command(text) else None