code: def validate(self, value):
          
          if isinstance(value, (str, unicode)) and not re.match(self.__pattern, value):
              raise orb.errors.ColumnValidationError(self, 'The email provided is not valid.')
          else:
              return super(EmailColumn, self).validate(value)
docs: Validates the value provided is a valid email address,
          at least, on paper.
  
          :param value: <str>
  
          :return: <bool>