old_contents: # coding: utf-8
  from __future__ import unicode_literals
  
  import re
  
  from .common import InfoExtractor
  
  
  class JWPlatformIE(InfoExtractor):
      _VALID_URL = r'(?:https?://content\.jwplatform\.com/(?:feeds|players|jw6)/|jwplatform:)(?P<id>[a-zA-Z0-9]{8})'
      _TEST = {
          'url': 'http://content.jwplatform.com/players/nPripu9l-ALJ3XQCI.js',
          'md5': 'fa8899fa601eb7c83a64e9d568bdf325',
          'info_dict': {
              'id': 'nPripu9l',
              'ext': 'mov',
              'title': 'Big Buck Bunny Trailer',
              'description': 'Big Buck Bunny is a short animated film by the Blender Institute. It is made using free and open source software.',
              'upload_date': '20081127',
              'timestamp': 1227796140,
          }
      }
  
      @staticmethod
      def _extract_url(webpage):
          mobj = re.search(
              r'<(script|iframe)[^>]+?src=["\'](?P<url>(?:https?:)?//content.jwplatform.com/players/[a-zA-Z0-9]{8})',
              webpage)
          if mobj:
              return mobj.group('url')
  
      def _real_extract(self, url):
          video_id = self._match_id(url)
          json_data = self._download_json('http://content.jwplatform.com/feeds/%s.json' % video_id, video_id)
          return self._parse_jwplayer_data(json_data, video_id)
  
new_contents: # coding: utf-8
  from __future__ import unicode_literals
  
  import re
  
  from .common import InfoExtractor
  
  
  class JWPlatformIE(InfoExtractor):
      _VALID_URL = r'(?:https?://content\.jwplatform\.com/(?:feeds|players|jw6)/|jwplatform:)(?P<id>[a-zA-Z0-9]{8})'
      _TEST = {
          'url': 'http://content.jwplatform.com/players/nPripu9l-ALJ3XQCI.js',
          'md5': 'fa8899fa601eb7c83a64e9d568bdf325',
          'info_dict': {
              'id': 'nPripu9l',
              'ext': 'mov',
              'title': 'Big Buck Bunny Trailer',
              'description': 'Big Buck Bunny is a short animated film by the Blender Institute. It is made using free and open source software.',
              'upload_date': '20081127',
              'timestamp': 1227796140,
          }
      }
  
      @staticmethod
      def _extract_url(webpage):
          mobj = re.search(
              r'<(?:script|iframe)[^>]+?src=["\'](?P<url>(?:https?:)?//content.jwplatform.com/players/[a-zA-Z0-9]{8})',
              webpage)
          if mobj:
              return mobj.group('url')
  
      def _real_extract(self, url):
          video_id = self._match_id(url)
          json_data = self._download_json('http://content.jwplatform.com/feeds/%s.json' % video_id, video_id)
          return self._parse_jwplayer_data(json_data, video_id)
  
subject: Use non-capturing group in RE