Hello, hope someone can help?

I need a bullet proof function to which I can send a
variable to see whether it contains a valid cell/range
address.

As you all know range addresses may vary quite a bit:

A:A
$1:8
C$5
R27:$AC$4759

etc.

Perhaps in another function, to test if a variable
contains a valid named range?

Your example code would be most appreciated. Thanks in
advance.