- Foundry Router User Guide

Foundry AR-Series Router User Guide

!AS Matches any AS number except the given one.

AS1 -AS2 Is a range of ASs. It matches all AS numbers between AS1 and AS2 inclusive.

!AS1 - AS2 This matches all numbers except the given one.

. Matches any number.

null Matches an empty (0 length) string, e.g., (AS1 empty AS2) is equivalent to

(AS1 AS2).

term {m, n} A term followed by {m, n} (where m and n are both non-negative integers and

m <= n) means at least m and at most n repetitions.

term {m} A term followed by {m} (where m is a positive integer) matches m or more

repetitions of term.

term {m,} A term followed by {m,} (where m is a positive integer) matches m or more

repetitions of term

term * A term followed by * matches zero or more repetitions of term. This is

shorthand for {0,}.

term + A term followed by + matches one or more repetitions of term. This is

shorthand for {1,}.

term ? A term followed by ? matches zero or one repetition of term. This is shorthand

for {0,1}.

[ as_range_list

]

Brackets union the items of an as_range_list. An item of this list can be either

an AS or a range. For example, {AS1 AS2 - AS3 AS4] is equivalent to (AS1 |

AS2-AS3 | AS4).

( regex ) Parentheses group expressions to make a term out of any regex. An operator,

such as * or ?, works on a regular expression enclosed in parentheses as it

would any term.