How Do I Validate Algebraic Expression In Javascript

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Javascript

Java

HTML

I'm new to Regular expression validations in javascript.

My textbox allows the user to enter FORMULA which needS to be validated client side.

My Formula Can be made of following operators

+
_
*
/
(
)
%

these are the only symbols allowed in my textbox.

need to validate a formula

wchic should be like "CurrentbaseSalary+CurrentMBP(BPI)"

but should not be "+BPI-CBI("
should be a valid formula.

please help.

Thanks in advance.