Email Validation in Objective C

-(BOOL)emailValidation:(NSString *)email {
    BOOL result;
    //checking email validation
    NSString *emailRegEx = @"[A-Z0-9a-z._-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegEx];
    //Valid email address
    if ([emailTest evaluateWithObject:email] == YES){
        NSLog(@"Valid email address");
        result=NO;
    }else{
        NSLog(@"Invalid email address");
        result=YES;
    }
    return result;
}