[c-nsp] REGEX tool?

[Scott Granados]

Hi Nick, that's pretty much where I was heading I think.  I have the same issue with JunOS as well in that they use a slightly different symbology in their expressions as well.

Hmmm time to brush up the perl skills I think.

Thanks for your response, much appreciated.

On Jun 25, 2013, at 4:35 PM, Nick Hilliard <nick at foobar.org> wrote:

> On 25/06/2013 20:44, Scott Granados wrote:
>> Wondering if anyone has any good suggestions for a tool for creating and
>> managing complex regular expressions?  I'm especially looking for a good
>> way to generate / expand the members of a complex expression or to do a
>> diff and generate a expression from that diff.  Any pointers would be
>> most appreciated.  THis is for manipulating complex community
>> environments.
> 
> This sort of thing is pretty hairy.  It's possible to do, but because cisco
> implemented their own variant of regular expressions, you will need to find
> a cisco-specific regexp optimiser.  If you can't find this, then you will
> in theory need to write a cisco-regexp to nondeterministic finite state
> automata converter.  Once you've converted to a FSA, you can play around
> with standard tools and then convert back again.  No idea if there is any
> code out there which will do this automatically, but there are plenty of
> standard (i.e. perl) regexp optimisation libs available on the net.
> 
> Nick
>