> You'll have to come up with a regular expression to check for bad
> characters. How complex are the equations? If they are like your example,
> you can just check that the equation doesn't have any letters and is only
> made up of [0-9+*-/()] characters.

It's pretty complex.  What I gave was a very simplistic example.  The numbers
are actually going to be table.fieldnames and the values in those fields are going
to be referenced to get the actual number used in the equation.  However, once
I interpolate the fieldnames to numbers I guess I could run the equation against
some sort of regex to make sure that it's valid.
hmmm....  Might be easier than I thought.

Thanks for the input!


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