> It shouldn't be that hard to parse this type of expressions.

I appreciate your concern, and will do my best to validate the input,
but there are two things:

1)  The application will only be used by selected users.
2)  The range of possibilities are broader than I indicated.  They
would like to be able to enter conditions of all sorts.  i.e.

($x / $y) > 0.5
(($a+$b+$c) / $d) < .75


If you have any suggestions on how to increase the security while
maintaning the flexibility, I'd be happy to hear it.


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