验证邮箱的合法性

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    self.title=@"验证邮箱的合法性";
    
    NSString *email=@"123456@qq.com";
    NSLog(@"--%i-",[self isValidateEmail:email]);
    
}
//用正则表达式
-(BOOL)isValidateEmail:(NSString *)email {
    
    NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
    
    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
    
    return [emailTest evaluateWithObject:email];
    
}