[nsp] regexp question

[David Flynn]

Hi Peter,

You have to use the backreference because doing ([^_])+ attempts to apply
that pattern to an input as many times as possible - it doesn't ensure that
it matches the same thing twice (ie, 11 and 123 would match the above).

The generic solution is:

^([^_]_)\1*([^_]_)\2*$

HOWEVER, I just crashed a 7200 running 12.2(18)S2 by attempting to use a
backreference.  YMMV.

..david