Fix "invalid escape sequences" error on Python 3.6

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

diff --git a/youtube_dl/extractor/metacafe.py b/youtube_dl/extractor/metacafe.py
index e6e7659a1de0ebe86f48a4128192de5d14d6d586..9880924e692380fffde3d0c776da329225de4ef8 100644 (file)
--- a/youtube_dl/extractor/metacafe.py
+++ b/youtube_dl/extractor/metacafe.py
@@ -133,7 +133,7 @@ class MetacafeIE(InfoExtractor):
         video_id, display_id = re.match(self._VALID_URL, url).groups()
 
         # the video may come from an external site
-        m_external = re.match('^(\w{2})-(.*)$', video_id)
+        m_external = re.match(r'^(\w{2})-(.*)$', video_id)
         if m_external is not None:
             prefix, ext_id = m_external.groups()
             # Check if video comes from YouTube