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-rw-r--r--lib/PublicInbox/View.pm2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/PublicInbox/View.pm b/lib/PublicInbox/View.pm
index 09afdaf1..83ae99bc 100644
--- a/lib/PublicInbox/View.pm
+++ b/lib/PublicInbox/View.pm
@@ -528,7 +528,7 @@ sub attach_link ($$$$;$) {
         $desc = $fn unless defined $desc;
         $desc = '' unless defined $desc;
         my $sfn;
-        if (defined $fn && $fn =~ /\A[[:alnum:]][\w\.-]+[[:alnum:]]\z/) {
+        if (defined $fn && $fn =~ /\A$PublicInbox::Hval::FN\z/o) {
                 $sfn = $fn;
         } elsif ($ct eq 'text/plain') {
                 $sfn = 'a.txt';