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  1. or download this
    /@(?!bar\.).*\.example\.com$/
  2. or download this
    /@(?!bar\.example\.com$).*\.example\.com$/
  3. or download this
    my $ex= ".example.com";
# ...
    if(  /@(?!bar\Q$ex\E$)\Q$ex\E$/  ) {
  4. or download this
    my $ex= quotemeta(".example.com");
# ...
    if(  /@(?!bar$ex$)$ex$/  ) {
  5. or download this
    /@(.*\.)?(?!bar\.)[^.]+\.example\.com$/
  6. or download this
    /@((.*\.)?(?!bar\.)[^.]+\.)?example\.com$/