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There are variations between implementations of the regular expression syntax, but most adhere to similar rules. You can find it in your Visual Studio documentation or on-line at tips on the SQLCLR have shown how to create a SQLCLR project, Writing to an operating system file using the SQL Server SQLCLR, or to compile a .
If it all works, you can continously monitor your address list to ensure email addresses continue to be valid - Some mail servers may return a positive response even if the mailbox doesn’t exist.
Regular expressions are expressions in a mini-language specific to searching text strings. There are also libraries of regular expressions that can be found. For validating e-mails I've chosen an expression from the MSDN .
They are perfectly suited to the task of validating e-mail addresses. Net documentation in an example that shows how to validate e-mail addresses.
While I could have improved the T-SQL in my function validating e-mail addresses, which requires a lot of string handling, T-SQL isn't the best technology for this problem. Net code handles better then T-SQL a SQLCLR scalar function can be a great solution.
When introduced in SQL Server 2005, the SQLCLR allows stored procedures, functions, triggers, user-defined types and user-defined aggregates to be written in C#, VB. I showed how to write a SQLCLR stored procedure in the tip Writing to an operating system file using the SQL Server SQLCLR.
Another important point to consider is that do you need to be performing this?