code: def _validate_logical_id(cls, logical_id):
          
          pattern = re.compile(r'^[A-Za-z0-9]+$')
          if logical_id is not None and pattern.match(logical_id):
              return True
          raise InvalidResourceException(logical_id, "Logical ids must be alphanumeric.")
docs: Validates that the provided logical id is an alphanumeric string.
  
          :param str logical_id: the logical id to validate
          :returns: True if the logical id is valid
          :rtype: bool
          :raises TypeError: if the logical id is invalid