-- '%[^a-z]%'

CREATE Function [dbo].[RemoveNonAlphaCharacters](@Temp VarChar(1000))
Returns VarChar(1000)
AS
Begin
 
    While PatIndex('%[^a-z]%', @Temp) > 0
        Set @Temp = Stuff(@Temp, PatIndex('%[^a-z]%', @Temp),  1, '')
 
    Return @TEmp
End

-- '%[^a-z0-9]%'

CREATE Function [dbo].[RemoveNonAlphaNumericCharacters](@Temp VarChar(1000))
Returns VarChar(1000)
AS
Begin
 
    While PatIndex('%[^a-z0-9]%', @Temp) > 0
        Set @Temp = Stuff(@Temp, PatIndex('%[^a-z0-9]%', @Temp), 1, '')
 
    Return @Temp
End

-- '%[^0-9]%'

CREATE Function [dbo].[RemoveNonNumericCharacters](@Temp VarChar(1000))
Returns VarChar(1000)
AS
Begin
 
    While PatIndex('%[^0-9]%', @Temp) > 0
        Set @Temp = Stuff(@Temp, PatIndex('%[^0-9]%', @Temp), 1, '')
 
    Return @TEmp
End