Find non-ASCII characters in varchar columns using SQL Server

Question

How can rows with non-ASCII characters be returned using SQL Server?
If you can show how to do it for one column would be great.

I am doing something like this

Answer 1

This script searches for non-ascii characters in one column. It generates a string of all valid characters, here code point 32 to 127. Then it searches for rows that don't match the list:

declare @str varchar(128)
declare @i int
set @str = ''
set @i = 32
while @i <= 127
    begin
    set @str = @str + '|' + char(@i)
    set @i = @i + 1
    end

select  col1
from    YourTable
where   col1 like '%[^' + @str + ']%' escape '|'