Testing valid mail address using exec

Question

I have wrote the below function to validate the email address entered by user.

function checkEmail(v_email)
{
var l_ret=true;
var l_reg = /^[a-z0-9._-]+@[a-z0-9.-]{2,}[.][a-z]{2,3}$/;
if (l_reg.exec(v_email)==null){l_ret=false;}
return l_ret;
}

It works perfectly fine.. with lowercase email address, (example.myemail@example.com) but if it detect any capital letter then it fails. like (example.MYemail@example.com).

I am trying to make it work for both capital as well as lower letter but i am not able to make it.. any one good with regex..could please suggest.

thank you in advance...

regards, Mona..

Of course this regular expression only matches a subset of valid email addresses, and including capitals will not improve the situation much. For something better see http://www.regular-expressions.info/email.html — Jon, Oct 05 '13 at 10:56
[Stop Validating Email Addresses With Complicated Regular Expressions](http://davidcel.is/blog/2012/09/06/stop-validating-email-addresses-with-regex/) — Anirudha, Oct 05 '13 at 11:08

score 1 · Answer 1 · answered Oct 05 '13 at 10:55

1

Simply use the case insensitive mode:

/^[a-z0-9._-]+@[a-z0-9.-]{2,}[.][a-z]{2,3}$/i;
                                            ^

It makes [a-z] also match uppercase letters. Otherwise, you can use [A-Za-z] to mean both upper and lowercase characters in regex.

answered Oct 05 '13 at 10:55

Jerry

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Hi Jerry.. thank you for reply.. just would like to know the above my regex will validate whole email address or just part..as JON said above...so thought will ask you.. – SmartDev Oct 05 '13 at 10:59
even space is a valid character in emailid..so are ;:^!()%...Don't use regex to parse email..plz – Anirudha Oct 05 '13 at 11:03
@monamona Yes, I know. I simply answered your question; which was to make the regex work for both uppercase and lowercase letters. Parsing valid email addresses is another question and the site has a lot of duplicate questions like that. – Jerry Oct 05 '13 at 11:06
@monamona:- You may find this Thread helpful:- http://stackoverflow.com/questions/46155/validate-email-address-in-javascript – Rahul Tripathi Oct 05 '13 at 11:08
1

Thank you all for your valuable answers... at this moment this solved my purpose.. so i will go ahead with this. thank you once again.. – SmartDev Oct 05 '13 at 11:29

Anirudha · Answer 2 · 2013-10-05T15:39:29.993

1

Noooooooooooo you DONT use regex to validate EMAIL..

An Email is valid if you can send a mail to it..

To validate Email,follow these steps..

1>Send Mail to that email address in which you can put an activation code or even a link.
2>If you receive the respose,email is valid..

At max your regex should be

^[^@]+@[^@]+$

Stop Validating Email Addresses With Complicated Regular Expressions

edited Oct 05 '13 at 15:39

answered Oct 05 '13 at 11:01

Anirudha

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score 0 · Answer 3 · answered Oct 05 '13 at 10:56

0

Change your regex like this:

var l_reg = /^[a-z0-9._-]+@[a-z0-9.-]{2,}[.][a-z]{2,3}$/i;

instead of

 var l_reg = /^[a-z0-9._-]+@[a-z0-9.-]{2,}[.][a-z]{2,3}$/;

answered Oct 05 '13 at 10:56

Rahul Tripathi

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even space is a valid character in emailid..so are ;:^!()%...Don't use regex to parse email..plz – Anirudha Oct 05 '13 at 11:02
@Anirudh:- Very correct! But OP's question is very specific: **I am trying to make it work for both capital as well as lower letter but i am not able to make it** – Rahul Tripathi Oct 05 '13 at 11:04

score 0 · Answer 4 · answered Oct 05 '13 at 10:56

0

Make the regex ignore the case by adding the flag i like below:

var l_reg = /^[a-z0-9._-]+@[a-z0-9.-]{2,}[.][a-z]{2,3}$/i;

answered Oct 05 '13 at 10:56

Harry

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even space is a valid character in emailid..so are ;:^!()%...Don't use regex to parse email..plz – Anirudha Oct 05 '13 at 11:03
@Anirudh: I am not exactly recommending this method. I am merely answering the OP's question on how to make it ignore case. – Harry Oct 05 '13 at 11:05

Testing valid mail address using exec

4 Answers4