[YouTube] Improve nsig function name extraction

Fixes player b7910ca8, using `,` vs `;`
See https://github.com/ytdl-org/youtube-dl/issues/32292#issuecomment-1602231170

Co-authored-by: dirkf

1 files changed, 13 insertions, 6 deletions

diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index 1855fca7f..24e2efbd9 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -1623,15 +1623,22 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
         nfunc, idx = re.match(target, nfunc_and_idx).group('nfunc', 'idx')
         if not idx:
             return nfunc
+
+        VAR_RE_TMPL = r'var\s+%s\s*=\s*(?P<name>\[(?P<alias>%s)\])[;,]'
+        note = 'Initial JS player n function {0} (%s[%s])' % (nfunc, idx)
+
+        def search_function_code(needle, group):
+            return self._search_regex(
+                VAR_RE_TMPL % (re.escape(nfunc), needle), jscode,
+                note.format(group), group=group)
+
         if int_or_none(idx) == 0:
-            real_nfunc = self._search_regex(
-                r'var %s\s*=\s*\[([a-zA-Z_$][\w$]*)\];' % (re.escape(nfunc), ), jscode,
-                'Initial JS player n function alias ({nfunc}[{idx}])'.format(**locals()))
+            real_nfunc = search_function_code(r'[a-zA-Z_$][\w$]*', group='alias')
             if real_nfunc:
                 return real_nfunc
-        return self._parse_json(self._search_regex(
-            r'var %s\s*=\s*(\[.+?\]);' % (re.escape(nfunc), ), jscode,
-            'Initial JS player n function name ({nfunc}[{idx}])'.format(**locals())), nfunc, transform_source=js_to_json)[int(idx)]
+        return self._parse_json(
+            search_function_code('.+?', group='name'),
+            nfunc, transform_source=js_to_json)[int(idx)]
 
     def _extract_n_function(self, video_id, player_url):
         player_id = self._extract_player_info(player_url)