X-Git-Url: http://www.git.stargrave.org/?a=blobdiff_plain;f=lib%2FPublicInbox%2FMID.pm;h=14089f914ab8923c129fd1249ddfc87c75989ac3;hb=9bd675d33ad1e49bd2ebe12a1d216216e61380de;hp=7f1ab15ea731db8f0f70304662afe338754b5c6c;hpb=cf439203c31836e4c48f632f902aa58db6924972;p=public-inbox.git

diff --git a/lib/PublicInbox/MID.pm b/lib/PublicInbox/MID.pm
index 7f1ab15e..14089f91 100644
--- a/lib/PublicInbox/MID.pm
+++ b/lib/PublicInbox/MID.pm
@@ -1,4 +1,4 @@
-# Copyright (C) 2015-2018 all contributors <meta@public-inbox.org>
+# Copyright (C) 2015-2019 all contributors <meta@public-inbox.org>
 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
 #
 # Various Message-ID-related functions.
@@ -26,11 +26,11 @@ sub mid_clean {
 	$mid;
 }
 
-# this is idempotent
+# this is idempotent, used for HTML anchor/ids and such
 sub id_compress {
 	my ($id, $force) = @_;
 
-	if ($force || $id =~ /[^\w\-]/ || length($id) > MID_MAX) {
+	if ($force || $id =~ /[^a-zA-Z0-9_\-]/ || length($id) > MID_MAX) {
 		utf8::encode($id);
 		return sha1_hex($id);
 	}