Something like this?
/@(?!bar\.).*\.example\.com$/
though that rejects "...@bar.foo.example.com" as well. This might be a good thing or a bad thing or a don't-care thing, you didn't specify.
So you could instead go for:
/@(?!bar\.example\.com$).*\.example\.com$/
If your teacher will let you declare a variable, then you could even use:
my $ex= ".example.com";
# ...
if( /@(?!bar\Q$ex\E$)\Q$ex\E$/ ) {
or
my $ex= quotemeta(".example.com");
# ...
if( /@(?!bar$ex$)$ex$/ ) {
But all of these don't reject "...@foo.bar.example.com" which you might want to do, so you could go for:
/@(.*\.)?(?!bar\.)[^.]+\.example\.com$/
/@((.*\.)?(?!bar\.)[^.]+\.)?example\.com$/
Updated based on
shenme's reply.
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tye
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