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Although I acknowledge my T-SQL UDF is not totally optimized, in my tests of validating 10,000 email addresses the SQLCLR took SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE FUNCTION [dbo].[udf_Txt_Is Email] ( @Email Addr varchar(255) -- Email address to check ) RETURNS BIT -- 1 if @Email Addr is a valid email address /* * Checks an text string to be sure it's a valid e-mail address. * Example: SELECT CASE WHEN 1=dbo.udf_Txt_Is Email('[email protected]') THEN 'Is an e-mail address' ELSE 'Not an e-mail address' END * * Test: print case when 1=dbo.udf_txt_is Email('[email protected]') then 'Passes' else 'Fails' end ' test for good addr' print case when 0=dbo.udf_txt_is Email('@novicksoftware.com') then 'Passes' else 'Fails' end ' test for no user' print case when 0=dbo.udf_txt_is Email('[email protected]') then 'Passes' else 'Fails' end ' test for 1 char domain' print case when 1=dbo.udf_txt_is Email('[email protected]') then 'Passes' else 'Fails' end ' test for 2 char domain' print case when 0=dbo.udf_txt_is Email('[email protected]') then 'Passes' else 'Fails' end ' test for no domain' print case when 0=dbo.udf_txt_is Email('anov [email protected]') then 'Passes' else 'Fails' end ' test for space in name' print case when 0=dbo.udf_txt_is Email('ano#[email protected]') then 'Passes' else 'Fails' end ' test for # in user' print case when 0=dbo.udf_txt_is Email('[email protected]*software.com') then 'Passes' else 'Fails' end ' test for * asterisk in domain' ****************************************************************/ AS BEGIN DECLARE @Alphabet Plus VARCHAR(255) , @Max INT -- Length of the address , @Pos INT -- Position in @Email Addr , @OK BIT -- Is @Email Addr OK -- Check basic conditions IF @Email Addr IS NULL OR NOT @Email Addr LIKE '_%@__%.__%' OR CHARINDEX(' ', LTRIM(RTRIM(@Email Addr))) It's not the most efficient of code. One of the features of this function is that the header comment includes a series of tests.While these might be not be the most complete set of tests for an e-mail validation function, there the ones that I've been using for awhile. In SSMS, just select the text and execute the script.The SQLCLR alternative will use a regular expression to validate the e-mail address. There are many tutorials that you can find on-line if you want to learn more.

validating sql syntax-78

I gave the function the name ns_txt_email and Visual Studio created a prototype function as shown here: Writing the code was pretty simple, given that there was an example in the Visual Studio documentation.

There were a few steps that I needed to take: The Regex.

Trans 'sqlservr.exe' (Managed): Loaded 'C:\WINDOWS\assembly\GAC_MSIL\System. Sec 'sqlservr.exe' (Managed): Loaded 'C:\WINDOWS\assembly\GAC_MSIL\System. Xml 'sqlservr.exe' (Managed): Loaded 'ns_txt', Symbols loaded.

Auto-attach to process '[5968] sqlservr.exe' on machine 'nsl6' succeeded.

When you send e-mail to large lists, validating the e-mail addresses before sending out the e-mail is worth doing to prevent having mail rejection messages clog up your mail server.

I had been doing the validation with a T-SQL User Defined Function (UDF), but it was getting too slow as the number of e-mails grew.'sqlservr.exe' (Managed): Loaded 'C:\WINDOWS\assembly\GAC_32\mscorlib.0 'sqlservr.exe' (Managed): Loaded 'C:\Program Files\Microsoft SQL Server\M 'sqlservr.exe' (Managed): Loaded 'C:\WINDOWS\assembly\GAC_32\System.Data 'sqlservr.exe' (Managed): Loaded 'C:\WINDOWS\assembly\GAC_MSIL\System.0 'sqlservr.exe' (Managed): Loaded 'C:\WINDOWS\assembly\GAC_32\System.I'm sure that I could improve the T-SQL a lot to make it faster, but I doubt that the T-SQL UDF is ever going to get close.At least in this case SQLCLR can be dramatically faster in terms of CPU and the difference in elapsed time is even larger.The next task is to build and deploy the project and try the function.

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