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Which three AS paths match the regular expression?

You are evaluating a routing policy for an ISP and you find the ^42+ .* (23|9)$ regular expression.Which three AS paths match the regular expression? (Choose three.)

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A.
42 42 42 42 9

B.
42 42 23 500

C.
42 42 42 60 9

D.
42 60 23 9 42

E.
42 69 500 23

2 Comments on “Which three AS paths match the regular expression?

  1. dg says:

    Table 1-3 Supported regular expression metacharacters
    Metacharacter Description
    ^ Matches the beginning of the input string.
    Alternatively, when used as the first character within brackets—[^ ]—matches any number except the ones specified within the brackets.
    $ Matches the end of the input string.
    . Matches any single character, including white space.
    * Matches 0 or more sequences of the immediately previous character or pattern.
    + Matches 1 or more sequences of the immediately previous character or pattern.
    ? Matches 0 or 1 sequence of the immediately previous character or pattern.
    () Specifies patterns for multiple use when followed by one of the multiplier metacharacters: asterisk *, plus sign +, or question mark ?
    [ ] Matches any enclosed character; specifies a range of single characters.
    – (hyphen) Used within brackets to specify a range of AS or community numbers.
    _ (underscore) Matches a ^, a $, a comma, a space, a {, or a }. Placed on either side of a string to specify a literal and disallow substring matching. Numerals enclosed by underscores can be preceded or followed by any of the characters listed above.
    | Matches characters on either side of the metacharacter; logical OR.




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