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Asked: 2026-05-16T01:22:28+00:00

I’m working on a project involving C# and a SQL Server 2008 database. In

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I’m working on a project involving C# and a SQL Server 2008 database.
In one of the tables, I have a field (nvarchar(15)) which will contain an IP address.

I’d like to add a check constraint which will validate that the input value is actually an IP address.

I wanted to use a regex to do that, but it seems that this feature is not supported by default. I saw things about writing a customm dll with UDF inside (MSDN tutorial), but I don’t really understand how it works (i.e. where should I place the dll ?)

Is there a “simple” way to add such a constraint ?
Any solution is welcome.

Thanks in advance !

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1 Answer

  1. Editorial Team

    There are several way of doing this – the most performant one would probably be a CLR function in the database.

    This is because SQL has fairly poor text manipulation tooling and no native RegEx in SQL Server.

    As other have said, this is better handled by an application before insertion to the DB.

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