Re: How to extend ^TO_

On Fri, Jan 24, 2014 at 4:21 PM, Geoff Soper
<[email protected]> wrote:
> Hi,
> in various places within my procmail recipes I have the following string:
> (^TO_|Delivered-To:)
>
> How can I define this as a variable that I can use repeatedly in my recipes
> and how do I include it in my recipes?

I'm not sure LuKreme actually answered your question ... his example
showed definitions of $NL and $WS for newline and whitespace but
didn't show any uses of them.

To define the pattern as a variable, you just use assignment syntax:

Delivered_TO = '(^TO_|Delivered-To:(.*[^-a-zA-Z0-9_.])?)'

(I've taken the liberty of fixing your pattern so that the scan of
Delivered-To: will behave like the rest of the headers examined by
^TO_)

Unlike the shell, procmail doesn't care about spaces around the "=",
use them or omit them as you please.  Capitalization in the variable
name doesn't matter either, some people prefer all-caps to
differentiate variables from other strings in the pattern more
plainly.

To use it in a recipe, you probably need to use braces around the variable name:

:0
* ${Delivered_TO}geoff\.procmail2401
procmail-stuff

You could instead put parens around the pattern that follows:

:0
* $Delivered_TO(geoff\.procmail2401)
procmail-stuff

Either one will separate the "TO" from the "geoff", otherwise procmail
would try to look up "Delivered_TOgeoff" as the variable name and find
nothing.

As a last note, because $name is expanded as a variable reference, you
may sometimes have to use ($)name if you want to match a two-line
string that has "name" at the start of the second line.