Steve,

I would not consider those examples "GOOD".

-- i.e. check constraint

([Telephone] like '([0-9][0-9][0-9])[0-9][0-9][0-9]-[0-9][0-9][0-9][0-9]' or

[Telephone] like '[0-9][0-9][0-9].[0-9][0-9][0-9].[0-9][0-9][0-9][0-9]')

You can do similar things for IPs. I guess it is a bit complex but C# or VB code is not going to be, by any order of magnitude, any rosier.