could you explain to me about bgp Regular expression

From: Mike Hwang (empires@hanaro.com)
Date: Wed Jul 04 2007 - 03:24:15 ART

Hi ! folks

I didn't know below regular expression.
Pls. explain to me for example...

Thanks
Mike

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ip as-path access-list 101 permit ^([0-9]+)(_\1)*$

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