[rules-users] not operation available in drools

[Davide Sottara]

Are the two conditions constraints inside the same pattern or two different
patterns?
In the former case, DeMorgan's laws also apply:

( a != "x") || ( b != "y" )

and you should anyway be able to use free-form boolean expressions inside a
pattern,
provided that you use one of the latest versions.

Otherwise (two patterns), see the previous posts.

Best,
Davide

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