[nsp] regexp question

[David Flynn]

* I (davidf at woaf.net) wrote:
> The generic solution is:
> 
> ^([^_]_)\1*([^_]_)\2*$

Actually, its more fun than that - you want the second part to be
optional iirc:

giving: ^([^_]_)\1*(([^_]_)\3*)?$

..david