FWIW

>  a definition of your symbols

it confused me too, till I remembered that some notations use a quote ' for boolean negation.

So

+ or 
* and
' not
() grouping
= assignment

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Cheers Rolf
(addicted to the Perl Programming Language and ☆☆☆☆ :)
Je suis Charlie!

In reply to Re^2: Parsing Boolean expressions by LanX
in thread Parsing Boolean expressions by Anonymous Monk

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