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-rw-r--r--lib/PublicInbox/WWW.pm2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/PublicInbox/WWW.pm b/lib/PublicInbox/WWW.pm
index 10c2e7ca..5b4d6c18 100644
--- a/lib/PublicInbox/WWW.pm
+++ b/lib/PublicInbox/WWW.pm
@@ -23,7 +23,7 @@ use PublicInbox::GitHTTPBackend;
 our $INBOX_RE = qr!\A/([\w\.\-]+)!;
 our $MID_RE = qr!([^/]+)!;
 our $END_RE = qr!(T/|t/|R/|t\.mbox(?:\.gz)?|t\.atom|raw|)!;
-our $ATTACH_RE = qr!(\d[\.\d]*)-([\w\.-]+[a-zA-Z0-9])!i;
+our $ATTACH_RE = qr!(\d[\.\d]*)-([[:alnum:]][\w\.-]+[[:alnum:]])!i;
 
 sub new {
         my ($class, $pi_config) = @_;