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1jQuery(document).ready(function($) {
2    $('#registerform').find(':submit').click(function(e) {
3        if( ! isGmail( $('#user_email').val() ) ) {
4            e.preventDefault(); // Prevent the form from submitting
5            alert('You can only register with an @gmail.com email address!');
6            return false;
7        }
8    });
9});
10
11function isGmail( address ) {
12    return address.indexOf("@gmail.com", this.length - 10) !== -1;
13}
14	
15function is_valid_email_domain($login, $email, $errors ){
16    $valid_email_domains = array("gmail.com","yahoo.com");// whitelist
17    $valid = false;
18    foreach( $valid_email_domains as $d ){
19        $d_length = strlen( $d );
20        $current_email_domain = strtolower( substr( $email, -($d_length), $d_length));
21        if( $current_email_domain == strtolower($d) ){
22            $valid = true;
23            break;
24        }
25    }
26    // if invalid, return error
27    if( $valid === false ){
28        $errors->add('domain_whitelist_error',__( '<strong>ERROR</strong>: you can only register using gmail or yahoo emails' ));
29    }
30}
31
32add_action('register_post', 'is_valid_email_domain',10,3 );