Here is the validate.js code for the script I am using (which refers to validating the email box).

        this.setHandler('email',
            function (value) {
                regex=/^[a-zA-Z0-9._-]+@([a-zA-Z0-9.-]+\.)+[a-zA-Z0-9.-]{2,4}$/;
                return regex.test(value);
            }
        );

Is it possible to change this somehow to only allow it to accept certain email domans, such as "@gmail.com" so you couldn't register with another, such as "@hotmail.com"

Thanks.

replace the regex string with something like this:

regex=/^[a-zA-Z0-9._-]+@(gmail|hotmail)\.com$/;

BTW your regex is incorrect because it will allow the address somesht@somedomain.c-m or even aa@bb...9

Well they would want a valid email anyway if they want to receive the verification email. But I will use your suggestion from now on.

Thanks.

What is the reason of using input validation if you send verification email anyway?

I only want people from a certain company to register.