Hi Scott, Nick,
I seem to recall that the second edition of Jeffrey Friedl's book on
regular expressions there was a description of how the deterministic and
non-deterministic machinery worked. It might have had some pseudo code
there, but it's been a long time.
(Full disclosure: I was a reviewer for the various editions, not a
co-author so I don't have a $ interest in it.)
On Tue, 25 Jun 2013, Scott Granados wrote:
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 <[email protected]> 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
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