The \ escape the following character and tells teh regular expression
parser to match the character literally. From
<http://w3.pppl.gov/info/emacs/Regexps.html> ...
. (Period) is a special character that matches any single character
except a newline. Using concatenation, we can make regular expressions
like `a.b', which matches any three-character string that begins with
`a' and ends with `b'.
I belive :0: means to use a lockfile. Don't quote me on that though.
Mohammad
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Zoki wrote:
> *** I think I'm starting to understand what helped you through the long
> dark nights while working on procmail...
>
> It's a bitch to understand how to use, but boy does it work nicely when
> you do.
>
> I wonder if you could shed some light on the following:
>
> I saw in one of your mails how to filter on X-Mailer. You were using:
> .*redhat@redhat-list\.com
>
> What does the \ do?
>
> Another thing would be the use of :0 and :0:. I understood that :0: worked
> as a lock on a mailbox in case more filters use it. Would that be correct?
>
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