This should do just what you want:
(defrule only-when-starts-with-B-and-D-NOT-present
(not (value /B.*/))
(not (value /D.*/))
=>
(printout t "B* and D* NOT present" crlf)
)
This rule has two conditions: that there are no B* facts, and that there are
no D* facts. Both must be met for the rule to fire.
On Monday 07 May 2007 4:04:59 pm Mike Stopper wrote:
> I'm having trouble getting my head set straight on this one..
>
> I'd like to be able to have a rule fire if two or more facts are NOT true
> using regular expressions, but can't seem to figure out the right rule
> def.
>
> Given the following setup:
>
> (assert (value "aa"))
> (assert (value "Bb"))
> (assert (value "cc"))
> (assert (value "Dd"))
> (assert (value "ee"))
>
> (defrule only-when-starts-with-B-and-D-present
> (value /B.*/)
> (value /D.*/)
> =>
> (printout t "B* and D* present" crlf)
> )
>
> yields
>
> B* and D* present
>
>
> but I can't seem to figure out how to get this one to work such that the
> RHS is fired only when no fact starts with either /B.*/ or /D.*/ regular
> expressions...
>
> (assert (value "aa"))
> ;;(assert (value "Bb"))
> (assert (value "cc"))
> ;;(assert (value "Dd"))
> (assert (value "ee"))
>
> (defrule only-when-starts-with-B-and-D-NOT-present
>
> (value /(?!B).*/)
> (value /(?!D).*/)
> =>
> (printout t "B* and D* NOT present" crlf)
> )
>
> fires whether or not B and D are present or not.
>
> I've tried various incarnations of the tests, using a Jess "not"
> condition, various flavors of regex expressions, all to no avail. Can
> anyone tell me what I'm doing wrong?? Is it a misuse of facts/rules, or a
> misunderstanding of just what the LHS can do?
>
> Thanks.
>
>
> -- Mike
> ____________________
>
> Michael Stopper
> Systems Development Scientist
> SPS Enterprise Architect
> CACI Transformation Solutions Group
>
> Tel 703.460.1845
> Mobile 703.407.7058
> [EMAIL PROTECTED] | www.caci.com
--
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