What is the difference between those two BGP regular

From: CCIE (ccie@axizo.com)
Date: Mon Nov 05 2007 - 09:21:57 ART

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What is the difference between those two BGP regular expressions?

^[0-9]+(_[0-9])?$

^[0-9]+(_[0-9]?)$

Regards,

Amin

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