Just a guess but try "^ $" to match beginning and end with nothing in
between.  Or you can match against "^ 1234{0,1} $" which matches the
null as or a single occurrence of only AS 1234 (just insert any unused
AS).

-J Scott

On Mon, Jun 21, 2010 at 3:10 PM, Leah Lynch <leah.ly...@clearwire.com> wrote:
> I cannot seem to get any of the regular expressions that I know of for null 
> AS to work. I have tried "()" and <*> and neither expression returns any 
> results. Does anyone out there have a known working expression for this on 
> M/MX routers?
>
> Leah
>
>
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