Find out if a string contains only ASCII characters

Question

I need to know whether a string contains only ASCII characters. So far I use this REGEX:

DECLARE
    str VARCHAR2(100) := \'xyz\';
BEGIN
    IF REGEXP_LIKE(s         


        

Answer 1

ASCII function with upper limit of 127 may be used :

declare
    str nvarchar2(100) := '\xyz~*-=)(/&%+$#£>|"éß';
    a   nvarchar2(1);
    b   number := 0;
begin
    for i in 1..length(str)
    loop                 
      a := substrc(str,i,1);
      b := greatest(ascii(a),b);      
    end loop;

    if b < 128 then  
     dbms_output.put_line('String is composed of Pure ASCII characters');
    else
     dbms_output.put_line('String has non-ASCII characters');      
    end if; 
end;