Auto add member based on user email domain to a BP group and a Membership on registration

code.php

<?php

add_action( 'user_register', 'assign_membership_on_register', 10, 1 );
function assign_membership_on_register( $user_id ){
	$user_info = get_userdata( $user_id );
	$email = $user_info->user_email;
	// Here school1, school2 are the email domains, ms_id is membership id and bp_id is the group id
	$data = array(
		      'school1' => array(
				'ms_id' => 1343,
				'bp_id' => 5
			),
		      'school2' => array(
				'ms_id' => 2973,
				'bp_id' => 6
			)
		      );
	
	$output = getBetween( $email, '@', '.' );
	groups_accept_invite( $user_id, $data[$output]['bp_id'] );
	
	$member = MS_Factory::load( 'MS_Model_Member', $user_id );
	$subscription = $member->add_membership( $data[$output]['ms_id'] );
	
	if ( $member->has_membership() ) {
		$member->is_member = true;
	} else {
		$member->is_member = false;
	}
	$member->save();
}

function getBetween($content,$start,$end){
    $r = explode($start, $content);
    if (isset($r[1])){
        $r = explode($end, $r[1]);
        return $r[0];
    }
    return '';
}