如何从C＃中的字符串中删除不在括号内的所有逗号？

I have a mathparser that can do functions like "IntPow(3,2)". If a user pastes "1,000,000" and then adds a plus symbol, making the full equation "1,000,000+IntPow(3,2)" the parser fails because it does not work with numbers that contain commas.I have a mathparser that can do functions like