newbie question: Regular expression lookbehind?

JS:

I've read that javascript regular expression do not have 'lookbehind'
functionality.

Given the following text:

class monkey(blah):

I would like to contruct a regular expression that matches 'monkey'.
So far I have:

new RegExp("^\\s*class\\s([A-Za-z]+)", 'gm')

How do I ignore 'class' without a lookbehind?. I think my regular
expression is returning two groups:
0: class monkey
1: monkey

I only want it to return the second group.

Can anyone point me in the right direction?
Thanks in advance,
cjl

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