#pragma mark --密碼同時包含6~18位數字和大小寫字母，不包含特殊字元的判斷方法（正則表示式）

+ (NSString *)isOrNoPasswordStyle:(NSString *)passWordName

{
    
    NSString * message;
    
    if (passWordName.length<6 message="@'密碼不能少於6位，請您重新輸入';" else="" if="" passwordname="" length="">18)
        
    {
        
        message = @"密碼最大長度為18位，請您重新輸入";
        
    }
    
    else if ([self JudgeTheillegalCharacter:passWordName])
        
    {
        
        message = @"密碼不能包含特殊字元，請您重新輸入";
        
    }
    
    else if (![self judgePassWordLegal:passWordName])
        
    {
        
        message = @"密碼必須同時包含字母和數字";
        
    }
    
    return message;
    
}

+ (BOOL)JudgeTheillegalCharacter:(NSString *)content{
    
    //提示標籤不能輸入特殊字元
    
    NSString *str 
 
[email protected]"^[A-Za-z0-9\\u4e00-\u9fa5]+$";
    
    NSPredicate* emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", str];
    
    if (![emailTest evaluateWithObject:content]) {
        
        return YES;
        
    }
    
    return NO;
    
}

+ (BOOL)judgePassWordLegal:(NSString *)pass{
    
    BOOL result ;
    
    // 判斷長度大於6位後再接著判斷是否同時包含數字和大小寫字母
    
    NSString * regex 
 
[email protected]"^(?![0-9]+$)(?![a-zA-Z]+$)[0-9A-Za-z]{6,18}$";
    
    NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];
    
    result = [pred evaluateWithObject:pass];
    
    NSLog(@"%hhd",result);
    
    return result;
    
}

君凱商聯網-iOS-字唐名僧