sql server - How do I remove extended ASCII characters from a string in T-SQL?

Question

I need to filter out (remove) extended ASCII characters from a SELECT statement in T-SQL.

I'm using a stored procedure to do so.

Expected input:

????eeee????

Expected output:

eeee

All that I've found is for MySQL.

I'm using :

Microsoft SQL Server Management Studio  11.0.2100.60
Microsoft .NET Framework    4.0.30319.17929

Answer 1

OK, give this a try. It seems the same issue they have. Anyway you need to modify it based on your requirements.

CREATE FUNCTION RemoveNonASCII 
(
    @nstring nvarchar(255)
)
RETURNS varchar(255)
AS
BEGIN

    DECLARE @Result varchar(255)
    SET @Result = ''

    DECLARE @nchar nvarchar(1)
    DECLARE @position int

    SET @position = 1
    WHILE @position <= LEN(@nstring)
    BEGIN
        SET @nchar = SUBSTRING(@nstring, @position, 1)
        --Unicode & ASCII are the same from 1 to 255.
        --Only Unicode goes beyond 255
        --0 to 31 are non-printable characters
        IF UNICODE(@nchar) between 32 and 255
            SET @Result = @Result + @nchar
        SET @position = @position + 1
    END

    RETURN @Result

END
GO

Check it out at SqlServerCentral