How to match all email addresses at a specific domain using regex?

Question

I need help on finding a regex expression that will match email addresses of only a specific domain

As in any .*@testdomain.com

And also the opposite any thing other than .*@testdomain.com

Answer 1

Ay

I propose an expression very simple:

^[A-Za-z0-9._%+-][email protected]$

and for the negative check:

^[A-Za-z0-9._%+-]+@(?!testdomain.com)[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$

I hope could work for you

Answer 2

@Kushal I found an easy way to do this, but it was somewhat tricky, because I had to retrieve via ajax the domain from a global variable stored somewhere else.

Here is the following line of code inside a javascript validation method:

return new RegExp("^\\w+([-+.']\w+)*@"+getDomain.responseJSON.d+"$").test(value.trim());

I create a new RegExp on the spot and test the value (email input) to see if it matches the domain.

• The string inside quotes is the regex that may contain any kind of name the user has.
• The getDomain.responseJSON.d, is the dynamic global domain variable (in case I want it changed and did not want to interfere with the source code.) that was retrieved with a $.getJSON(); call to a WCF service.

If you want something more elaborate but have standard domains, then it can go like this:

return /^\w+([-+.']\w+)*@?(example1.com|example2.com)$/.test(value.trim());