c#結合正則表達式驗證輸入的字符串

using System.Text.RegularExpressions;

#region 驗證輸入的字符串
    /// <summary>
    /// 判斷輸入的字符類型　
    /// </summary>
    /// <param name="_value">輸入的字串</param>
    /// <param name="_kind">要驗證的類型</param>
    /// 1: 由26個英文字母組成的字串
    /// 2: 正整數
    /// 3: 非負整數（正整數 + 0)
    /// 4: 非正整數（負整數 + 0）
    /// 5: 負整數
    /// 6: 整數
    /// 7: 非負浮點數（正浮點數 + 0）
    /// 8: 正浮點數
    /// 9: 非正浮點數（負浮點數 + 0)
    /// 10: 負浮點數
    /// 11: 浮點數
    /// 12: 由26個英文字母的大寫組成的字串
    /// 13: 由26個英文字母的小寫組成的字串
    /// 14: 由數位和26個英文字母組成的字串
    /// 15: 由數位、26個英文字母或者下劃線組成的字串
    /// 16: Email
    /// 17: URL
    /// 18: 只能輸入入中文
    /// 19:
    /// </param>
    /// <returns>true是驗証通過,false是驗証錯誤</returns>
    /// <returns></returns>

    public  bool ValidateUserInput(String _value, int _kind)
    {
        string RegularExpressions = null;

        switch (_kind)
        {
            case 1:
                //由26個英文字母組成的字串
                RegularExpressions = "^[A-Za-z]+$";
                break;
            case 2:
                //正整數
                RegularExpressions = "^[0-9]*[1-9][0-9]*$";
                break;
            case 3:
                //非負整數（正整數 + 0)
                RegularExpressions = "^\\d+$";
                break;
            case 4:
                //非正整數（負整數 + 0）
                RegularExpressions = "^((-\\d+)|(0+))$";
                break;
            case 5:
                //負整數
                RegularExpressions = "^-[0-9]*[1-9][0-9]*$";
                break;
            case 6:
                //整數
                RegularExpressions = "^-?\\d+$";
                break;
            case 7:
                //非負浮點數（正浮點數 + 0）
                RegularExpressions = "^\\d+(\\.\\d+)?$";
                break;
            case 8:
                //正浮點數
                RegularExpressions = "^(([0-9]+\\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\\.[0-9]+)|([0-9]*[1-9][0-9]*))$";
                break;
            case 9:
                //非正浮點數（負浮點數 + 0）
                RegularExpressions = "^((-\\d+(\\.\\d+)?)|(0+(\\.0+)?))$";
                break;
            case 10:
                //負浮點數
                RegularExpressions = "^(-(([0-9]+\\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\\.[0-9]+)|([0-9]*[1-9][0-9]*)))$";
                break;
            case 11:
                //浮點數
                RegularExpressions = "^(-?\\d+)(\\.\\d+)?$";
                break;
            case 12:
                //由26個英文字母的大寫組成的字串
                RegularExpressions = "^[A-Z]+$";
                break;
            case 13:
                //由26個英文字母的小寫組成的字串
                RegularExpressions = "^[a-z]+$";
                break;
            case 14:
                //由數位和26個英文字母組成的字串
                RegularExpressions = "^[A-Za-z0-9]+$";
                break;
            case 15:
                //由數位、26個英文字母或者下劃線組成的字串
                RegularExpressions = "^[0-9a-zA-Z_]+$";
                break;
            case 16:
                //email地址
                RegularExpressions = "\\w+([-+.']\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*";
                break;
            case 17:
                //url
                RegularExpressions = "^[a-zA-z]+://(\\w+(-\\w+)*)(\\.(\\w+(-\\w+)*))*(\\?\\S*)?$";
                break;
            case 18:
                //只能輸入中文
                RegularExpressions = "^[^\u4E00-\u9FA5]";
                break;
            case 19:
                //只能输入0和非0打头的数字
                RegularExpressions = "^(0|[1-9][0-9]*)$";
                break;
            case 20:
                //只能输入数字
                RegularExpressions = "^[0-9]*$";
                break;
            case 21:
                //只能輸入數字加2位小數
                RegularExpressions = "^[0-9]+(.[0-9]{1,2})?$";
                break;
            case 22:
                //只能输入0和非0打头的数字加2位小數
                RegularExpressions = "^(0|[1-9]+)(.[0-9]{1,2})?$";
                break;
            case 23:
                //只能输入0和非0打头的数字加2位小數  但不匹配0.00
                RegularExpressions = "^(0(.(0[1-9]|[1-9][0-9]))?|[1-9]+(.[0-9]{1,2})?)$";
                break;
            default:
                break;
        }

        Match m = Regex.Match(_value, RegularExpressions);

        if (m.Success)
            return true;
        else
            return false;

    }
    #endregion