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(?) Procmail and regular expressions....(Snowwhite...)

From Andrew Higgs

Answered By Ben Okopnik, Mike Orr, Faber Fedor

(?) Hi all,

While on the subject....any suggestions on a good place to find out about regular expressions and procmail.

I collect mail from one ISP mailbox and send it on to the correct user based on email address. I also have a problem with people who use mailing list groups in Outlook etc. How do I split these properly?

Any pointers gratiously accepted.

(!) [Ben] "procmail" uses extended regexes, much the same as "egrep". So, for some good examples and broad-scope explanations of those, try 
man procmailex
man procmailrc
man grep         # The "REGULAR EXPRESSIONS" section is a great reference
man regex        # Somewhat different "flavor", but useful
For single address to multiple local user resolution, read the "Email Addressing FAQ (How to use user+box@host addresses)" at www.faqs.org/faqs/mail/addressing/ - as it happens, I just ran into this thing yesterday, and was much impressed with the logical style and layout of it. Even if this is not exactly what you're doing, there are a number of relevant useful techniques described in this document - and it's mostly based on doing it with "procmail".
(!) [Mike] Ben! You even wrote the article about procmail antispam filtering and you didn't mention it. :) Just in case Andrew hasn't seen it:
http://linuxgazette.net/issue62/okopnik.html
(!) [Faber] Let me through out this little tidbit:
If you use the \< and \> word boundary markers in procmail, keep in mind that they consume (eat) the word boundary. Every other program I've used the word boundary markers on did not eat them.
Makes a BIG difference when your grepping your text (and took me an hour to figure out!).
Regards,
Faber Fedor

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