In the book "Internet Architectures" by Hassam, it said that ^1 ?[0-9]*$
identify all the AS_paths that start with 1 and of length 2-that is, AS1 and
its direct customs. But i think that ? means 0 or 1 occurrences, when it is
0, the expression can be equal ^1[0-9]*$,means any single AS number start
with 1.
Am I right? If so, which is the right answer of all the AS_paths that start
with 1 and of length 2. Thanks.
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