re question

[Dan Bar Dov]

I'm trying to construct a regular expression to match valid IP address,
without leading zeroes (i.e
1.2.3.4, 254.10.0.0, but not 324.1.1.1, nor 010.10.10.1)

This is what I come up with, and it does not work.

r'(^[12]?\d{0,2}\.){3,3}[12]?\d{0,2}'

What am I doing wrong?
Any common knowledge IP matching RE?

Thanks,
Dan
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