[Python] Optional \s inside group not getting captured [duplicate]

I have this string:

"232_0452 Render 2.mov"


And this regex:

.*(\s?[Rr]ender).*


If I execute:

match = re.match(r'.*(\s?[Rr]ender).*', "232_0452 Render 2.mov")
print(match.group(1))


I expect the output to be " Render". Instead it is "Render"

Why does the optional white space character not get captured to the group, and how can I write this so that it does?

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