Difference between "?" and "*" in BGP regular expression

From: Evgeniy Voloshin (e.voloshin@equant.ru)
Date: Mon Feb 27 2006 - 04:56:39 GMT-3

Hi group,

1. can you explain me difference between "?" and "*" for examlpe
^254_([0-9]*)$
^254(_[0-9]+)?$

2. why I must use parenthesis "(" and ")" in my regexp? Is it for
private AS only? 

---
WBR,
Yev.

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