--- a/filter/hnf.pl
+++ b/filter/hnf.pl
@@ -244,7 +244,7 @@
         $uri = '?%year%month%hiday#%year%month%day0'; # for hns-1.x
       }
       $uri =~ s/%%/\34/g;
-      $uri =~ s/%{?([a-z]+)}?/$param{$1}/g;
+      $uri =~ s/%\{?([a-z]+)}?/$param{$1}/g;
       $uri =~ s/\34/%/g;
       $uri = $hnf::diary_uri . $uri;
       $uri =~ s/%7E/~/i;
--- a/filter/mp3.pl
+++ b/filter/mp3.pl
@@ -152,7 +152,7 @@
     mp3::get_title($$contref, $weighted_str, $fields);
     mp3::get_author($$contref, $fields);
     mp3::get_album($$contref, $fields);
-    $$contref =~ s/^\w+:{1,1}?//gm;
+    $$contref =~ s/^\w+:?//gm;
 
     return;
 }