diff --git a/youtube_dl/extractor/bilibili.py b/youtube_dl/extractor/bilibili.py
index 3e3348ef5..4d6b051fe 100644
--- a/youtube_dl/extractor/bilibili.py
+++ b/youtube_dl/extractor/bilibili.py
@@ -114,7 +114,7 @@ class BiliBiliIE(InfoExtractor):
 
         if 'anime/' not in url:
             cid = self._search_regex(
-                r'cid(?:["\']:|=)(\d+)', webpage, 'cid',
+                r'\bcid(?:["\']:|=)(\d+)', webpage, 'cid',
                 default=None
             ) or compat_parse_qs(self._search_regex(
                 [r'EmbedPlayer\([^)]+,\s*"([^"]+)"\)',