[iOS]邮箱验证

            1 -(BOOL)isValidateEmail:(NSString *)email {
2     NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}"; 
3     NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex]; 
4return [emailTest evaluateWithObject:email];
5 }