Validation of e-mail addresses

Hello the Experts of Oracle

Oracle Database 11 g Enterprise Edition Release 11.1.0.7.0 - 64 bit Production
With partitioning, OLAP, Data Mining and Real Application Testing options

I have a few email addresses syntax to validate. I did some of my homework but I need expert advice.

I have not yet completely serached the Oracle forum. If someone did or led in the validation of email address please send me the link. I will be grateful

With tab as
(
SELECT "Jbond008 @[email protected]" email from dual Union All
SELECT ' jbond... [email protected]' an email from dual Union All
SELECT ' jbond.008@yahoo... com' an email from dual Union All
SELECT 'Jbond009@hotm%%il.com' Union double, All email
SELECT '[email protected]' Union double, All email
SELECT ' ^ * @hotmail.co.in () ' email from dual Union All
SELECT 'abc@hotmailcoin' Union double, All email
SELECT '[email protected]' From Dual email
)
Select * from tab where
not REGEXP_LIKE (upper (trim (EMAIL)), "[A-Z0-9_%-]+@[A-Z0-9._%-]+\. [A - Z] {2,4} ")"
or regexp_count (upper (trim (EMAIL)),' @') > 1

Validates the rules I have are:

1. no two sign an email address @.
2 No. two period (.) in an e-mail
3. after sign @ no special character or numeric character not only Alphabets
4 at a before @ sign character should be alpha or numeric
5. at least one period should be there after the sign @.
6. the last email address (@Abc.office) must be valid

Thanks for the help/tips

Rajesh

Published by: 792498 on September 2, 2010 12:55

Hi, Renon,

I saw not as rigorous as that desired e-mail validation request.

It would be much easier in PL/SQL, but performance will be slower.

If you want to do in pure SQL, I suggest to use the test in a CASE statement, so that you can see easily all channels of test and the results of each.
Comment by your regular expressions, like this:

SELECT        email
,       CASE
          WHEN  REGEXP_LIKE ( UPPER ( TRIM (email))
                            , '[A-Z0-9_%-]+'     || -- 1 or more common characters
                        '@'               || -- @ sign
                        '[A-Z0-9._%-]+'     || -- 1 or more common characters
                        '\.'          || -- dot
                        '[A-Z]{2,4}'        -- 2 to 4 letters
                      )
          THEN  'Good'
          ELSE  'Bad'
       END               AS outcome
FROM        tab
ORDER BY  email
;

It is good to use conditions composed, such as

WHEN  REGEXP_LIKE (...)
OR    regexp_count (upper(trim(EMAIL)),'@') > 1

If that helps. In this case, it is quite easy to test for exactly a sign in the expression of REGEP_LIKE @. (Also, I think you wanted to say "= 1" ", not > 1".)

When you say "2. No two period (.) in an e-mail", you mean not two * consecutive * periods, right? Addresses like "[email protected]" are in agreement.
In this case, you can start to refine your model like this:
{code}
SELECT E-mail
CASE
WHEN REGEXP_LIKE (UPPER (TRIM (email))
, '[A-Z0-9_%-]+'     || -1 or most common characters
' (' || -a group consising of...
'\.'          || -a simple point
'[A-Z0-9_%-]+'     || -1 or most common characters
')*'          || -the Group may be repeated 0 or more times
'@'               || -sign @.
'[A-Z0-9._%-]+'     || -1 or most common characters
'\.'          || -point
'[A Z] {2,4}' - 2 to 4 letters
)
CAN 'good '.
OTHER 'bad '.
AS END result
TAB
ORDER BY e-mail
;
{code}
As always, take baby steps. Add some characters to the model, then test it, to ensure that these characters are what you expect.

Published by: Frank Kulash, Sep 2, 2010 14:24

Tags: Database

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