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-rw-r--r--lib/PublicInbox/Filter.pm2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/PublicInbox/Filter.pm b/lib/PublicInbox/Filter.pm
index e5a8fafe..bd33130c 100644
--- a/lib/PublicInbox/Filter.pm
+++ b/lib/PublicInbox/Filter.pm
@@ -93,7 +93,7 @@ sub dump_html {
         my $err = "";
 
         # be careful about remote command injection!
-        if ($charset =~ /\A[A-Za-z0-9\-]+\z/) {
+        if ($charset =~ /\A([A-Za-z0-9\-]+)\z/) {
                 push @cmd, "-assume_charset=$charset";
         }
         if (IPC::Run::run(\@cmd, $body, \$out, \$err)) {