[iqiyi] Simplify and improve regex patterns

See the comments in #5849

youtube_dl/extractor/iqiyi.py

@@ -161,12 +161,11 @@ class IqiyiIE(InfoExtractor):
         webpage = self._download_webpage(
             url, 'temp_id', note='download video page')
         tvid = self._search_regex(
-            r'tvId ?= ?(\'|\")(?P<tvid>\d+)', webpage, 'tvid', flags=re.I, group='tvid')
+            r'data-player-tvid\s*=\s*[\'"](\d+)', webpage, 'tvid')
         video_id = self._search_regex(
-            r'videoId ?= ?(\'|\")(?P<video_id>[a-z\d]+)',
-            webpage, 'video_id', flags=re.I, group='video_id')
+            r'data-player-videoid\s*=\s*[\'"]([a-f\d]+)', webpage, 'video_id')
         swf_url = self._search_regex(
-            r'(?P<swf>http://.+?MainPlayer.+?\.swf)', webpage, 'swf')
+            r'(http://.+?MainPlayer.+?\.swf)', webpage, 'swf player URL')
         _uuid = uuid.uuid4().hex
 
         enc_key = self.get_enc_key(swf_url, video_id)