Emacs regexp problem

["mailpitches@email.com" <mailpitches@email.com>]

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Hello, I'm doing an emacs replace-regexp and the regexp behaves
differently from how it behaves in Python, and also differently from
how I expect.

I'm trying to add quotes around the parameter in a function call.
I.e.:
func(param) should be converted to func('param')

I use the following command:
M-x replace-regexp [enter] get\((.*)\) [enter] get('\1')) [enter]

and the result is func(param) is converted to func('(param)')

Why are those extra parentheses appearing in there; is this an error
on emacs' part?

Thanks