Fix "invalid escape sequences" error on Python 3.6

[youtube-dl] / youtube_dl / postprocessor / metadatafromtitle.py

diff --git a/youtube_dl/postprocessor/metadatafromtitle.py b/youtube_dl/postprocessor/metadatafromtitle.py
index 920573da9d8f472b8fdd8681cab0be1c6331afb7..164edd3a820af4d0c3d1af48b9cf81a6b5460e9b 100644 (file)
--- a/youtube_dl/postprocessor/metadatafromtitle.py
+++ b/youtube_dl/postprocessor/metadatafromtitle.py
@@ -12,7 +12,7 @@ class MetadataFromTitlePP(PostProcessor):
         self._titleregex = self.format_to_regex(titleformat)
 
     def format_to_regex(self, fmt):
-        """
+        r"""
         Converts a string like
            '%(title)s - %(artist)s'
         to a regex like