Email validation for Apex application text item field - oracle-apex

Question

I have an Apex application text item to enter the email ids with comma separator.
Now I want to validate the email address whether it's correct or not which entered in application item.
How to achieve this?
I am using the below code but its not working.
declare
l_cnt varchar2(1000);
l_requestors_name varchar2(4000);
begin
select apex_item.text(1) Member
into l_requestors_name
from dual;
if not l_requestors_name not like '%#%' then
return true;
else
return false;
end if;
end;

Answer 1

I'd suggest you to create a function which returns a Boolean or - as in my example - a character (Y - yes, it is valid; N - no, it isn't valid) (why character? You can use such a function in SQL. Boolean works in PL/SQL, but my example is pure SQL).
I guess it isn't perfect, but should be way better than just testing whether a string someone entered contains a monkey (#).
SQL> create or replace
2 function f_email_valid (par_email in varchar2)
3 return varchar2
4 is
5 begin
6 return
7 case when regexp_substr (
8 par_email,
9 '[a-zA-Z0-9._%-]+#[a-zA-Z0-9._%-]+\.[a-zA-Z]{2,4}')
10 is not null
11 or par_email is null then 'Y'
12 else 'N'
13 end;
14 end f_email_valid;
15 /
Function created.
SQL>
As user can enter several e-mail addresses separated by a comma, you'll have to split them into rows and then check each of them. Have a look:
SQL> with test (text) as
2 -- sample data
3 (select 'littlefoot#gmail.com,bigfootyahoo.com,a##hotmail.com,b123#freemail.hr' from dual),
4 split_emails as
5 -- split that long comma-separated values column into rows
6 (select regexp_substr(text, '[^,]+', 1, level) email
7 from test
8 connect by level <= regexp_count(text, ',') + 1
9 )
10 -- check every e-mail
11 select email, f_email_valid(email) is_valid
12 from split_emails;
EMAIL IS_VALID
------------------------------ --------------------
littlefoot#gmail.com Y
bigfootyahoo.com N
a##hotmail.com N
b123#freemail.hr Y
SQL>