how to remove all none alpha numeric characters from a string using sql code example

Example 1: t-sql remove all non-alphanumeric characters from a string

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

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

    Return @Temp
End

Example 2: sql remove non numeric characters

SELECT REGEXP_REPLACE( fieldname, '[^[:digit:]]', '' ) AS newfieldname FROM tablename

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