Validate and filter email address with RegEx?

Question

What's the best way to disallow free email service emails (e.g. Gmail, Yahoo, Hotmail) using RegEx and Javascript email field validation?

^.*@(?!(aol\.com$|yahoo\.com$|hotmail\.com$))$

I've seen the generic "Validate email address in Javascript" solution here Validate email address in JavaScript? but cant figure out how to make it disallow Gmail, Yahoo and Hotmail.

[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+(?:[A-Z]{2}|com|org|net|edu|gov|mil|biz|info|mobi|name|aero|asia|jobs|museum)\b

Do you have to use regular expressions? Could you instead just split on the @ and then compare to a blacklist of TLDs? — sdleihssirhc
– sdleihssirhc, Commented Aug 16, 2011 at 19:43
I'm using a 3rd party form framework that allows regular expressions for custom validation. Therefore, I have to use regular expressions. — Michael G.
– Michael G., Commented Aug 23, 2011 at 18:12

Brian · Accepted Answer · 2011-08-16 19:58:32Z

8

One of thousands of acceptable ways to get there - not that yours isn't acceptable...

function isGoodEmail(email) {
    if(isValidEmail(email)) {
        if(/(aol|gmail|yahoo|hotmail)\.com$/.test(email)) {
           alert(' valid email, but not for this site.  No free service emails!');
           return false;
        }
        return true;
    }
    return false;
}

function isValidEmail(email) {
  // implement using any of the email regexp's available 
}

edited Aug 16, 2011 at 19:58

answered Aug 16, 2011 at 19:42

Brian

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2 Comments

Michael G. Over a year ago

I have to use regular expressions.

Michael G. Over a year ago

Sorry for the confusion. I will make sure to edit the question.

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