[culturebox] Fix extraction (closes #14827)

youtube_dl/extractor/francetv.py

@@ -363,6 +363,6 @@ class CultureboxIE(FranceTVBaseInfoExtractor):
             raise ExtractorError('Video %s is not available' % name, expected=True)
 
         video_id, catalogue = self._search_regex(
-            r'"http://videos\.francetv\.fr/video/([^@]+@[^"]+)"', webpage, 'video id').split('@')
+            r'"https?://videos\.francetv\.fr/video/([^@]+@[^"]+)"', webpage, 'video id').split('@')
 
         return self._extract_video(video_id, catalogue)