On Thu, Aug 20, 2009 at 21:52, Jasen Betts<jasen@xnet.co.nz> wrote:
> On 2009-08-19, Clemens Schwaighofer <clemens_schwaighofer@e-gra.co.jp> wrote:
>> On Wed, Aug 19, 2009 at 02:11, Randal L. Schwartz<merlyn@stonehenge.com> wrote:
>>>>>>>> "Andre" == Andre Lopes <lopes80andre@gmail.com> writes:
>>>
>>> Andre> I'm developing a function with some checks, for example... to check if the
>>> Andre> e-mail is valid or not.
>>>
>>> How are you hoping to do this? The regex to validate an email
>>> address syntactically is pretty large:
>>>
>>> http://ex-parrot.com/~pdw/Mail-RFC822-Address.html
>>>
>>> And no, I'm not kidding. If your regex is smaller than that, you aren't
>>> validating email... you're validating something "kinda like email".
>>
>> Just in my opinion, this regex is completely too large. For basic
>> validating something like:
>>
^[A-Za-z0-9!#$%&'*+-\/=?^_`{|}~][A-Za-z0-9!#$%&'*+-\/=?^_`{|}~\.]{0,63}@[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]{1,})*\.([a-zA-Z]{2,4}){1}$
>> works very well
>
> not good: eg:
>
> fails this valid address* : admin@xxxxxxx.museum
yes it does, but all I need to change is {2,4}, to {2,6} or {2,}
> accepts this invalid one : you@gmail..com
and not it does not. I just tested it here.
The regex helps to avoid stuff like this:
foo]@bar.com
foo@@bar.com
foo@.bar.com
foo@bar
etc
>
> "musedoma" replaced with several x to protect the innocent from spam
>
> in some contexts email adrresses with no domain part are valid
> addresses with [bracketed] mx servers instead of a domain and/or bang
> paths are also allowed (but not in common use and often not desirable)
>
>
>
>
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