need help with regex and matchlist()

Hi,

As this is my first time I try to write a vimscript function that uses
regular expressions, I am a little bit of lost. Not sure which
built-in function is the most proper, and/or how to use it.

Let's say I have this line (very familiar for python developers):

def __init__(self, x, y, z):

I am trying to parse that line and end up with a list of input
options, like this

['x', 'y', 'z']

Any tip will be more than appreciated.
Thanks a lot in advance,
Jose

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