Question

Email Blacklist REgular Expression Rejecting A Domain That Is Not On The Blacklist

Asked by: labeler2003

I am using a regular expression to validate email addresses and not accept an email address from a domain identified as providing a free email service.  This is done based on the domain name in the email address.

The problem is that a valid email address (valid domain) is being rejected as invalid.

"usa.com" is a domain that is included on the blacklist.

 "dccusa.com" is being rejected, even though it is not on the blacklist.  I assume this is because it contains the domain "usa.com" which is on the blacklist.

Here is my test code:

<script language="JavaScript" src="blacklist.js"></script>
<SCRIPT LANGUAGE="JavaScript">
        var blacklist = new RegExp(blacklist.join("|"));
       var emailVar = "test@dccusa.com";
         if(emailPart=emailVar.match(/^\w+([\-\.]\w+)*\@(\w+([\-\.]\w+)*\.[a-z]{2,4})$/)){
                 if(blacklist.test(emailPart[2])){
                       alert("It appears that you have entered an email address from a free email service provider.
                  Unfortunately, we do not accept registrations from these email addresses.  Please enter a
                  different email address or call for assistance.");
                 }
         } else {
                alert("Please enter valid email address.");
         }
        alert ("The End.")

</script>

The following is what a segment of the blacklist looks like:
...
,"post.com"
,"sanfranmail.com
,"soon.com"
,"usa.com"
,"yours.com"
,"saudia.com"
,"terra.com.br"
,"uol.com.br"
,"yahoo.com"
...

What can I do so that "dccusa.com" will not be rejected as a valid domain for email?

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Asked On
2007-10-23 at 12:14:30ID22912792
Tags

blacklist

,

domain

,

email

,

expression

,

regular

Topic

Regular Expressions

Participating Experts
2
Points
500
Comments
4

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Answers

 

by: ddrudikPosted on 2007-10-23 at 12:25:19ID: 20133734

I would change:
if(blacklist.test(emailPart[2])){

To:
if(blacklist.test('"' + emailPart[2] + '"')){

 

by: b0lsc0ttPosted on 2007-10-23 at 13:22:44ID: 20134265

labeler2003,

Your second  test needs to be ...

                 exp = new RegExp("@" + emailPart[2]);
                 if(blacklist.test(re)){

You add the ampersat on so just the domain is matched, not part of it.

Let me know if you have any questions or need more information.

b0lsc0tt

 

by: labeler2003Posted on 2007-10-23 at 13:55:48ID: 20134497

ddrudik:

Your suggestion did not work, but I understood what you were trying to do and I applied the concept in a different way to get the solution.

I added a space after the | in the following line:

  var blacklist = new RegExp(blacklist.join("| "));

This put a space before each domain name in the list.

Then I changed the test to include a space:

                 if(blacklist.test(" " + emailPart[2])){

This worked.

b0lsc0tt:
I could not figure out what you were telling me to do.  I tried a few things based on the code you provided, but they did not work.

 

by: ddrudikPosted on 2007-10-23 at 14:17:05ID: 20134644

Glad it worked out.

20120131-EE-VQP-002

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