Python split and evaluate?

I don't think using re is such a bad idea. You could just go through replacing the nested parenthesis one at a time with the result of their operation. Seems pretty straight forward to me.

As Chris's, uh, variegated comments indicated, you can't have an (true) regular expression that will parse nested parentheses. (According to him, there are some sort of hacks and extensions that would broaden the expression-language to let it parse context-free grammars. This is the first I've heard of that, but it sounds like a bad idea to me.).

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