'id': 'tSVI8ta_P4w',
             'ext': 'mp4',
             'title': 'Vishal Sikka: The beauty and power of algorithms',
-            'thumbnail': 're:^https?://.+\.jpg',
+            'thumbnail': r're:^https?://.+\.jpg',
             'description': 'md5:6261fdfe3e02f4f579cbbfc00aff73f4',
             'upload_date': '20140122',
             'uploader_id': 'TEDInstitute',
                         'format_id': '%s-%sk' % (format_id, bitrate),
                         'tbr': bitrate,
                     })
-                    if re.search('\d+k', h264_url):
+                    if re.search(r'\d+k', h264_url):
                         http_url = h264_url
             elif format_id == 'rtmp':
                 streamer = talk_info.get('streamer')