More Complicated Expression

You can use the following operators in expressions:

+	Plus
-	Minus
*	Multiply
/	Division
(	Openning parenthesis
)	Closing parenthesis
^	Power

For example, this is a valid expression:
(Blah + 5) * MySecondVariable - (4 + 10 / Blah)

The order of the operators are like in math:
First "(" and ")" , then "^", then "*" and "/", and at last "+" and "-"

For example:
2 + 3 * 4   is equal to 14
(2 + 3) * 4   is equal to 20