On Mon, 21 Jul 2003, Matt Kettler wrote:
> At 06:30 PM 7/21/2003 -0400, Eric Hart wrote:
> > > URI rules
> > > META rules
> > > Use of PERL IF expressions in SA rules.
> > > CF processing algorithm
> >
> > Matt Kettler's howto at
> >http://mywebpages.comcast.net/mkettler/sa/SA-rules-howto.txt doesn't cover
> >these, unfortunately.
>
> Correct, I do however reference these rule types and point the reader in a
> general direction as to where to get information about them.
[snip]
> More or less.. meta rules allow you to do a variety of boolean expressions
> based on combinations of rules. The boolean syntax used is similar to that
> of C, and many other programing languages.
>
> The format of the boolean operators isn't in the manpage, but they are very
> common, so the man page writer seems to have assumed that anyone writing
> meta rules has a basic understanding of boolean expressions. Here's a short
> intro:
>
> || is a boolean OR operator... so TEST1 || TEST2 reads as "true if either
> TEST1 or TEST2 are true"
> && is a boolean AND operator
> ! is a boolean negation (NOT).
> () are used to force grouping of operations, just like in ordinary algebra.
>
> Thus the example in the manpage:
> meta META1 TEST1 && !(TEST2 || TEST3)
>
> Is true if TEST1 matches, and neither TEST2 nor TEST3 match.
Marvelous! Would you consider adding this to your - already
excellent! - howto?
Cheers,
- Bill
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