[exim] Regex Help?

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Lähettäjä: Marc Perkel
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Vastaanottaja: Exim users mailing list
Aihe: [exim] Regex Help?
Need some regex help. What I want to do is grab the domain part of a
sender host name where it is a one level domain.

xxx.ftp.perkel.com -> perkel.com

And a separate one that works with two level domains:

xxx.ftp.perkel.co.uk -> perkel.co.uk

Here's a crude poice of code I've been using. Need something like this.

    set acl_c_sender_host_domain = 
${sg{$sender_host_name}{(\N^.*\.)(.*\.(com|net|org|edu|biz|name|mil|gov))$\N}{\$2}}


Thanks in advance.