TSQL Email Validation (without regex)

Question

Ok, there are a million regexes out there for validating an email address, but how about some basic email validation that can be integrated into a TSQL query for Sql Server

Answer 1

This is the easiest way to select them.

Use this query

SELECT * FROM <TableName> WHERE [EMail] NOT LIKE '%_@__%.__%'

Answer 2

Create Function [dbo].[fnAppStripNonEmail](@Temp VarChar(1000))
Returns VarChar(1000)
AS
Begin

    Declare @KeepValues as varchar(50)
    Set @KeepValues = '%[^a-z,0-9,@,.,-]%'
    While PatIndex(@KeepValues, @Temp) > 0
        Set @Temp = Stuff(@Temp, PatIndex(@KeepValues, @Temp), 1, '')

    Return @Temp
End

Answer 3

Great answers! Based these recommendations I came up with a simplified function that combines the best 2 answers.

CREATE FUNCTION [dbo].[fnIsValidEmail]
(
    @email varchar(255)
)   
--Returns true if the string is a valid email address.  
RETURNS bit  
As  
BEGIN
    RETURN CASE WHEN ISNULL(@email, '') <> '' AND @email LIKE '%_@%_.__%' THEN 1 ELSE 0 END
END