[bilibili] Improve `_VALID_URL`

diff --git a/yt_dlp/extractor/bilibili.py b/yt_dlp/extractor/bilibili.py
index 1fe6a5c18c1b73ec304d251b77dcccedccd1951a..92c98827448494cf4290499fbad239a44d58a2b0 100644 (file)
--- a/yt_dlp/extractor/bilibili.py
+++ b/yt_dlp/extractor/bilibili.py
@@ -37,7 +37,7 @@ class BiliBiliIE(InfoExtractor):
                                 video/[aA][vV]|
                                 anime/(?P<anime_id>\d+)/play\#
                             )(?P<id>\d+)|
-                            video/[bB][vV](?P<id_bv>[^/?#&]+)
+                            (s/)?video/[bB][vV](?P<id_bv>[^/?#&]+)
                         )
                         (?:/?\?p=(?P<page>\d+))?
                     '''