[extractor/youtube] Improve nsig function name extraction

test/test_youtube_signature.py

@@ -159,6 +159,10 @@ _NSIG_TESTS = [
         'https://www.youtube.com/s/player/8c7583ff/player_ias.vflset/en_US/base.js',
         '1wWCVpRR96eAmMI87L', 'KSkWAVv1ZQxC3A',
     ),
+    (
+        'https://www.youtube.com/s/player/b7910ca8/player_ias.vflset/en_US/base.js',
+        '_hXMCwMt9qE310D', 'LoZMgkkofRMCZQ',
+    ),
 ]
 
 

yt_dlp/extractor/youtube.py

@@ -3140,7 +3140,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
             return funcname
 
         return json.loads(js_to_json(self._search_regex(
-            rf'var {re.escape(funcname)}\s*=\s*(\[.+?\]);', jscode,
+            rf'var {re.escape(funcname)}\s*=\s*(\[.+?\])[,;]', jscode,
             f'Initial JS player n function list ({funcname}.{idx})')))[int(idx)]
 
     def _extract_n_function_code(self, video_id, player_url):