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foreach $keys (%msgids) {
            if ($key =~ /$line/) {
                delete $msgids $key;
            }
      }

foreach $key (keys %msgids) {
            if ($key =~ /$line/) {
                delete $msgids{$key}
            }
      }

while (($key, $value) = each(%msgids)) {
            if ($key =~ /$line/) {
                delete $msgids{$key}
            }
      }