email address validation

wizard04

I'm trying to validate an email address field before it is submitted.
I have read RFC 822 (http://www.faqs.org/rfcs/rfc822.html) but I'm not
sure I'm fully grasping it. As far as I understand, a convoluted
email address like andy."har<ri>\"son"@example.com would be
valid. Please correct me if I'm wrong.

Jun 26 '07 #1

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2036

Darko

On Jun 26, 5:21 pm, wizard04 <wizar...@gmail.comwrote:

I'm trying to validate an email address field before it is submitted.
I have read RFC 822 (http://www.faqs.org/rfcs/rfc822.html) but I'm not
sure I'm fully grasping it. As far as I understand, a convoluted
email address like andy."har<ri>\"son"@example.com would be
valid. Please correct me if I'm wrong.

I think google search would give you a zillion links that give you
complete scripts and examples.

Jun 26 '07 #2

Jon Slaughter

"wizard04" <wi******@gmail.comwrote in message
news:11**********************@g4g2000hsf.googlegro ups.com...

I'm trying to validate an email address field before it is submitted.
I have read RFC 822 (http://www.faqs.org/rfcs/rfc822.html) but I'm not
sure I'm fully grasping it. As far as I understand, a convoluted
email address like andy."har<ri>\"son"@example.com would be
valid. Please correct me if I'm wrong.

Well, you have a quoted string in there so its ok...

basically you have andy."..."@example.com

which is fine. Anything in a quoted string and it only looks odd because it
isn't really used(actually I have no idea why its used). So as far as the
lexer is concerned, thats all just one token inside the quotes and it
doesn't get parsed any farther(except possibly for quoted pairs).

In reality its not convoluted but just looks a bit strange(not sure how mail
servers handle the quoted string though).

Jon

Jun 26 '07 #3

wizard04

Thanks Jon :-)

On Jun 26, 12:22 pm, "Jon Slaughter" <Jon_Slaugh...@Hotmail.com>
wrote:

Anything in a quoted string and it only looks odd because it
isn't really used(actually I have no idea why its used).

I don't expect anyone to actually have an address like this; I'm just
being a perfectionist. ;-)

(not sure how mail servers handle the quoted string though).

Good question! My web host won't let me create an address with quotes,
so that says something. Probably best not to allow special characters
at all (except the .).

Jun 26 '07 #4

Jon Slaughter

"wizard04" <wi******@gmail.comwrote in message
news:11*********************@p77g2000hsh.googlegro ups.com...

Thanks Jon :-)

On Jun 26, 12:22 pm, "Jon Slaughter" <Jon_Slaugh...@Hotmail.com>
wrote:
>Anything in a quoted string and it only looks odd because it
isn't really used(actually I have no idea why its used).

I don't expect anyone to actually have an address like this; I'm just
being a perfectionist. ;-)

>(not sure how mail servers handle the quoted string though).

Good question! My web host won't let me create an address with quotes,
so that says something. Probably best not to allow special characters
at all (except the .).

Yeah... you might also try some other rfc's just to be sure. The one you
gave,

RFC 822 - STANDARD FOR THE FORMAT OF ARPA INTERNET TEXT MESSAGES

Might not be the standard for what is used for the mail protocol that we
commonly use(which I guess is smtp or whatever).

Jun 26 '07 #5

Dr J R Stockton

In comp.lang.javascript message <11**********************@g4g2000hsf.goo
glegroups.com>, Tue, 26 Jun 2007 15:21:51, wizard04 <wi******@gmail.com>
posted:

>I'm trying to validate an email address field before it is submitted.
I have read RFC 822 (http://www.faqs.org/rfcs/rfc822.html) but I'm not
sure I'm fully grasping it. As far as I understand, a convoluted
email address like andy."har<ri>\"son"@example.com would be
valid. Please correct me if I'm wrong.

Since it is impossible to determine whether an actual address is correct
- here, *0723 is currently valid, but soon it will not be - there's no
point in rigorously checking the format (unless you are an issuer of new
addresses).

The only sensible tests are whether the field has been left empty, and
whether the field might be an E-address. See
<URL:http://www.merlyn.demon.co.uk/js-valid.htm#VEmA>.

It's a good idea to write the newsgroup c.l.j and its FAQ. See below.

--
(c) John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v6.05 IE 6
news:comp.lang.javascript FAQ <URL:http://www.jibbering.com/faq/index.html>.
<URL:http://www.merlyn.demon.co.uk/js-index.htmjscr maths, dates, sources.
<URL:http://www.merlyn.demon.co.uk/TP/BP/Delphi/jscr/&c, FAQ items, links.

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