code: def meta_contains_article_keyword(self, response, site_dict):
          
          contains_meta = response.xpath('//meta') \
              .re('(= ?["\'][^"\']*article[^"\']*["\'])')
  
          if not contains_meta:
              return False
          return True
docs: Determines wether the response's meta data contains the keyword
          'article'
  
          :param obj response: The scrapy response
          :param dict site_dict: The site object from the JSON-File
  
          :return bool: Determines wether the reponse's meta data contains the
                        keyword 'article'