Validating string for insertion

Question

I have a field to which the client has to fill in the blank with an ID, this string must have only numeric caracters, no alphabetic characters, an no spaces or any other special characters. What function can I use to validate this string in this field???
The string must have 13 caracters in length.
(WHEN-VALIDATE-ITEM TRIGGER)
lenString NUMBER;
BEGIN
lenString:=LENGTH(:client_info.id)
if lenString < 13 then
alert('Error!!!!!');
else
--------------validation for only numeric caracters and no special characters----------------
end if;
END;
Help please!!!!!

Answer 1

The best way would be to set property Format Mask of :client_info.id to 9999999999999
You will get forms error “FRM-40209 Filed must be of form 9999999999999”
If you want your custom error, you can create on-error trigger on this item:
if error_code = 40209 then
     message('Your message... ');
else
      message(error_type||'-'||to_char(error_code)||': '||ERROR_TEXT);
      RAISE Form_Trigger_Failure;
end if;     Anyway, if you want to use When-validate-item trigger to handle this instead of format mask - you can use to_number and handle exception:
--------------validation for only numeric caracters and no special characters----------------
declare
     x number;
begin
x:=to_number(:client_info.id);
exception
     when value_error then
     message ('Your message ….');       
end;
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