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regular expression for email format

Posted on 2009-05-18
2
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Last Modified: 2012-05-07
I have a function that evaluates whether an input matches a valid email format, but it is horribly slow.  Any ideas?

The validation it needs to run is:
start with valid name characters (A-Za-z0-9._) (am I missing any?)
then an @
then valid characters (A-Za-z0-9._) (am I missing any?)
then a .
then 2-4 characters
function isValidEmailFormat(strEmail){

//alert(strEmail);

    if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,2})+$/.test(strEmail)){

        return true;

    } else {

        if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(strEmail)){

            return true;

        } else {

            if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,4})+$/.test(strEmail)){

                return true;

            } else {

                return false;

            }

        }

    }

    return false; 

}

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Question by:nap0leon
2 Comments
 
LVL 19

Accepted Solution

by:
moagrius earned 500 total points
ID: 24412628
Here is a pretty sturdy email validation expression.  it'll include more complex emails containing multiple dots and odd domains.
var isemail = /[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?/i;
 

//  examples

var good = "bob@bob.com";

var bad = "bob@bob";

var complex = "jj.abrams@nbc.universal.com";

alert(isemail.test(good));

alert(isemail.test(bad));

alert(isemail.test(complex));

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Author Closing Comment

by:nap0leon
ID: 31582619
Appears to work great - thanks!
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