Parenthesis in regex in URLConf

Hello,
I have a regular expression for usernames and I want to use this regex
in my URLConf and bind that to a view. The problem is, I have
parenthesis in my regex which should not consider as *args*. Here's my
regex:

^[a-zA-Z0-9]+((\.[a-zA-Z0-9]+)|(_[a-zA-Z-0-9]+))*$

Values in '()' are necessary in my regex but I don't want to pass
these values to my view.
What should I do?

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