would the BGP regular expression "^820_.*_12" match the AS Path "820 1546 9612 12" ? and why?
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yepp, will match

in my own words:
^ - is start of a line
.* - means any symbol any number of times
_ - means null symbol = space between AS numbers
so your expression defines, that "orignating AS should be 820, then any other AS and then AS 12"

here is an explanation of symbols (from cisco website):

AymanDasaAuthor Commented:
dear ,

your answer incorrect i have ask ccie guy and he told me shuld be the AS inbetween ended with 12.

An AS_PATH beginning with AS 820, with zero or more intermediate ASNs
and delimiters, and ending with any AS whose last two digits are 45 (including
simply AS 12).

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