diff --git a/yt_dlp/extractor/facebook.py b/yt_dlp/extractor/facebook.py
index 1d1e76ec3..75340d88d 100644
--- a/yt_dlp/extractor/facebook.py
+++ b/yt_dlp/extractor/facebook.py
@@ -50,7 +50,7 @@ class FacebookIE(InfoExtractor):
                             [^/]+/videos/(?:[^/]+/)?|
                             [^/]+/posts/|
                             events/(?:[^/]+/)?|
-                            groups/[^/]+/(?:permalink|posts)/(?:[0-9a-f]*/)?|
+                            groups/[^/]+/(?:permalink|posts)/(?:[0-9a-f]+/)?|
                             watchparty/
                         )|
                     facebook: