Pl/sql(help me please)

Question

I have a problem.
When I read from a file I must respect the following rules:
The only characters admitted are :
Number: from 0 till 9
Alphanumeric:
Blank and A....Z (capital letters).
(The not capital letters and the letters with accent are deleted.)
The special letters: ! ‘’ % $ & ’ ( ) * +, - . / : ; < = > ?
All the others characters will be replaced by blanks.
How could I realize,easily this thing.
Yours,
Virginia

Answer 1

declare
abc VARCHAR2(1000);
in_file utl_file.file_type;
BEGIN
in_file :=utl_file.fopen('TEST_DIR','test.txt','R');
loop
  utl_file.get_line(in_file,abc);
  dbms_output.put_line('Line:'||abc);
  abc := translate(abc,trim(translate(abc,'0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!"%$',' ')),' ');
  dbms_output.put_line(abc);
  exit when abc is null;
end loop;
  utl_file.fclose(in_file);
EXCEPTION
when no_data_found then
  null;
END ;
Line:abc.?
abc
Line:+-/def.abc
defabc
Line:ghi/*+12345
ghi 12345
PL/SQL procedure successfully completed.