[extractor/cbc:gem] Update `_VALID_URL` (#6499)

Authored by: makeworld-the-better-one
Closes #6395

yt_dlp/extractor/cbc.py

@@ -202,7 +202,7 @@ class CBCPlayerIE(InfoExtractor):
 
 class CBCGemIE(InfoExtractor):
     IE_NAME = 'gem.cbc.ca'
-    _VALID_URL = r'https?://gem\.cbc\.ca/media/(?P<id>[0-9a-z-]+/s[0-9]+[a-z][0-9]+)'
+    _VALID_URL = r'https?://gem\.cbc\.ca/(?:media/)?(?P<id>[0-9a-z-]+/s[0-9]+[a-z][0-9]+)'
     _TESTS = [{
         # This is a normal, public, TV show video
         'url': 'https://gem.cbc.ca/media/schitts-creek/s06e01',
@@ -245,6 +245,9 @@ class CBCGemIE(InfoExtractor):
         },
         'params': {'format': 'bv'},
         'skip': 'Geo-restricted to Canada',
+    }, {
+        'url': 'https://gem.cbc.ca/nadiyas-family-favourites/s01e01',
+        'only_matching': True,
     }]
 
     _GEO_COUNTRIES = ['CA']