fixes to extractor regex, artist splitting, and half·alive test

yt_dlp/extractor/youtube/_video.py

@@ -1671,12 +1671,37 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
         'url': 'https://music.youtube.com/watch?v=DbCvuSGfR3Y',
         'info_dict': {
             'id': 'DbCvuSGfR3Y',
+            'ext': 'mp4',
             'title': 'Back Around',
             'artists': ['half·alive'],
             'track': 'Back Around',
             'album': 'Conditions Of A Punk',
             'release_date': '20221202',
             'release_year': 2021,
+            'alt_title': 'Back Around',
+            'description': 'md5:bfc0e2b3cc903a608d8a85a13cb50f95',
+            'media_type': 'video',
+            'uploader': 'half•alive',
+            'channel': 'half•alive',
+            'channel_id': 'UCYQrYophdVI3nVDPOnXyIng',
+            'channel_url': 'https://www.youtube.com/channel/UCYQrYophdVI3nVDPOnXyIng',
+            'channel_is_verified': True,
+            'channel_follower_count': int,
+            'comment_count': int,
+            'view_count': int,
+            'like_count': int,
+            'age_limit': 0,
+            'duration': 223,
+            'thumbnail': 'https://i.ytimg.com/vi_webp/DbCvuSGfR3Y/maxresdefault.webp',
+            'heatmap': 'count:100',
+            'categories': ['Music'],
+            'tags': ['half·alive', 'Conditions Of A Punk', 'Back Around'],
+            'creators': ['half·alive'],
+            'timestamp': 1669889281,
+            'upload_date': '20221201',
+            'playable_in_embed': True,
+            'availability': 'public',
+            'live_status': 'not_live',
         },
         'params': {
             'skip_download': True,
@@ -4207,15 +4232,14 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
 
         # Youtube Music Auto-generated description
         if (video_description or '').strip().endswith('\nAuto-generated by YouTube.'):
-            # Before you change this, learn how regexes work. The last guy didn't.
             mobj = re.search(
                 r'''(?xs)
                     (?:\n|^)(?P<track>[^\n·]+)\ ·\ (?P<artist>[^\n]+)\n+
                     (?P<album>[^\n]+)\n+
-                    (?:℗\s*(?P<release_year>\d{4})[^\n]+\n+)?
-                    (?:Released\ on\s*:\s*(?P<release_date>\d{4}-\d{2}-\d{2}))?
+                    (?:℗\s*(?P<release_year>\d{4}))?
+                    (?:.+?\nReleased\ on\s*:\s*(?P<release_date>\d{4}-\d{2}-\d{2}))?
                     (?:.+?\nArtist\s*:\s*(?P<clean_artist>[^\n]+)\n)?
-                    .+Auto-generated\ by\ YouTube\.\s*$
+                    .+\nAuto-generated\ by\ YouTube\.\s*$
                 ''', video_description)
             if mobj:
                 release_year = mobj.group('release_year')
@@ -4227,7 +4251,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
                 info.update({
                     'album': mobj.group('album'.strip()),
                     'artists': ([a] if (a := mobj.group('clean_artist'))
-                                else [a.strip() for a in mobj.group('artist').split('·')]),
+                                else [a.strip() for a in mobj.group('artist').split(' · ')]),
                     'track': mobj.group('track').strip(),
                     'release_date': release_date,
                     'release_year': int_or_none(release_year),