I need a demorgan function

I need a demorgan function

I need a function which can convert this expression

F1 and (F2 or F3)
to
(F1 and F2) or (F1 and F3)

private function Demorgan (Expr as string) as string
...
end function

plz help

What is a "demorgan function"?

I ask, because when I Googled this it came back with no matches at all.

F1: condition1, F2: ect...
I have a condition string: "F1 and (F2 or F3)"

to set ADODB.Recordset Filter property I need this form:
(F1 and F2) or (F1 and F3)

I want to convert my condition string automatically with a function. it is based on De morgan law...