Fix "invalid escape sequences" error on Python 3.6

[youtube-dl] / youtube_dl / extractor / libraryofcongress.py

diff --git a/youtube_dl/extractor/libraryofcongress.py b/youtube_dl/extractor/libraryofcongress.py
index 0a94366fd8059b093d6b6600e380d829b4fe34c7..40295a30b51f733b637c651cc8a434ede14f517a 100644 (file)
--- a/youtube_dl/extractor/libraryofcongress.py
+++ b/youtube_dl/extractor/libraryofcongress.py
@@ -25,7 +25,7 @@ class LibraryOfCongressIE(InfoExtractor):
             'id': '90716351',
             'ext': 'mp4',
             'title': "Pa's trip to Mars",
-            'thumbnail': 're:^https?://.*\.jpg$',
+            'thumbnail': r're:^https?://.*\.jpg$',
             'duration': 0,
             'view_count': int,
         },