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 程式師世界 >> 編程語言 >> .NET網頁編程 >> C# >> C#入門知識 >> C#結合正則表達式判斷各種用戶輸入合法性

C#結合正則表達式判斷各種用戶輸入合法性

編輯:C#入門知識

[csharp] 
using System; 
using System.Text.RegularExpressions; 
 
 namespace SG_VQCDataCollection 

    /// <summary> 
    /// 通過Framwork類庫中的Regex類實現了一些特殊功能數據檢查 
     /// </summary> 
     public class MetarnetRegex 
    { 
 
         private static MetarnetRegex instance = null; 
         public static MetarnetRegex GetInstance() 
         { 
           if (MetarnetRegex.instance == null) 
             { 
                 MetarnetRegex.instance = new MetarnetRegex(); 
             } 
             return MetarnetRegex.instance; 
         } 
         private MetarnetRegex() 
         { 
         } 
 
         /// <summary> 
         /// 判斷輸入的字符串只包含漢字 
         /// </summary> 
         /// <param name="input"></param> 
         /// <returns></returns> 
         public static bool IsChineseCh(string input) 
         { 
             //Regex regex = new Regex("^[\一-\龥]+$"); 
 
            //改了一下 
 
             Regex regex = new Regex("^[\一-\龥]+$"); 
             return regex.IsMatch(input); 
         } 
 
         /// <summary> 
         /// 匹配3位或4位區號的電話號碼,其中區號可以用小括號括起來, 
         /// 也可以不用,區號與本地號間可以用連字號或空格間隔, 
         /// 也可以沒有間隔 
         /// \(0\d{2}\)[- ]?\d{8}|0\d{2}[- ]?\d{8}|\(0\d{3}\)[- ]?\d{7}|0\d{3}[- ]?\d{7} 
         /// </summary> 
         /// <param name="input"></param> 
         /// <returns></returns> 
         public static bool IsPhone(string input) 
         { 
             string pattern = "^\\(0\\d{2}\\)[- ]?\\d{8}$|^0\\d{2}[- ]?\\d{8}$|^\\(0\\d{3}\\)[- ]?\\d{7}$|^0\\d{3}[- ]?\\d{7}$"; 
             Regex regex = new Regex(pattern); 
             return regex.IsMatch(input); 
         } 
 
         /// <summary> 
         /// 判斷輸入的字符串是否是一個合法的手機號 
         /// </summary> 
         /// <param name="input"></param> 
         /// <returns></returns> 
         public static bool IsMobilePhone(string input) 
         { 
             Regex regex = new Regex("^13\\d{9}$"); 
             return regex.IsMatch(input); 
 
         } 
 
 
         /// <summary> 
         /// 判斷輸入的字符串只包含數字 
         /// 可以匹配整數和浮點數 
         /// ^-?\d+$|^(-?\d+)(\.\d+)?$ 
         /// </summary> 
         /// <param name="input"></param> 
         /// <returns></returns> 
         public static bool IsNumber(string input) 
         { 
             string pattern = "^-?\\d+$|^(-?\\d+)(\\.\\d+)?$"; 
             Regex regex = new Regex(pattern); 
             return regex.IsMatch(input); 
         } 
 
         /// <summary> 
         /// 匹配非負整數 
         /// 
         /// </summary> 
         /// <param name="input"></param> 
         /// <returns></returns> 
         public static bool IsNotNagtive(string input) 
         { 
             Regex regex = new Regex(@"^\d+$"); 
             return regex.IsMatch(input); 
         } 
         /// <summary> 
         /// 匹配正整數 
         /// </summary> 
         /// <param name="input"></param> 
         /// <returns></returns> 
         public static bool IsUint(string input) 
         { 
             Regex regex = new Regex("^[0-9]*[1-9][0-9]*$"); 
             return regex.IsMatch(input); 
         } 
         /// <summary> 
         /// 判斷輸入的字符串字包含英文字母 
         /// </summary> 
         /// <param name="input"></param> 
         /// <returns></returns> 
         public static bool IsEnglisCh(string input) 
         { 
             Regex regex = new Regex("^[A-Za-z]+$"); 
             return regex.IsMatch(input); 
         } 
 
 
         /// <summary> 
         /// 判斷輸入的字符串是否是一個合法的Email地址 
         /// </summary> 
         /// <param name="input"></param> 
         /// <returns></returns> 
         public static bool IsEmail(string input) 
         { 
             string pattern = @"^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$"; 
             Regex regex = new Regex(pattern); 
             return regex.IsMatch(input); 
         } 
 
 
         /// <summary> 
         /// 判斷輸入的字符串是否只包含數字和英文字母 
         /// </summary> 
         /// <param name="input"></param> 
         /// <returns></returns> 
         public static bool IsNumAndEnCh(string input) 
         { 
             string pattern = @"^[A-Za-z0-9]+$"; 
             Regex regex = new Regex(pattern); 
             return regex.IsMatch(input); 
         } 
 
 
         /// <summary> 
         /// 判斷輸入的字符串是否是一個超鏈接 
         /// </summary> 
         /// <param name="input"></param> 
         /// <returns></returns> 
         public static bool IsURL(string input) 
         { 
             //string pattern = @"http://([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?"; 
             string pattern = @"^[a-zA-Z]+://(\w+(-\w+)*)(\.(\w+(-\w+)*))*(\?\S*)?$"; 
             Regex regex = new Regex(pattern); 
             return regex.IsMatch(input); 
         } 
 
 
         /// <summary> 
         /// 判斷輸入的字符串是否是表示一個IP地址 
         /// </summary> 
         /// <param name="input">被比較的字符串</param> 
         /// <returns>是IP地址則為True</returns> 
         public static bool IsIPv4(string input) 
         { 
 
             string[] IPs = input.Split('.'); 
             Regex regex = new Regex(@"^\d+$"); 
             for (int i = 0; i < IPs.Length; i++) 
             { 
                 if (!regex.IsMatch(IPs[i])) 
                 { 
                     return false; 
                 } 
                 if (Convert.ToUInt16(IPs[i]) > 255) 
                { 
                     return false; 
                 } 
             } 
             return true; 
         } 
 
 
         /// <summary> 
         /// 計算字符串的字符長度,一個漢字字符將被計算為兩個字符 
         /// </summary> 
         /// <param name="input">需要計算的字符串</param> 
         /// <returns>返回字符串的長度</returns> 
         public static int GetCount(string input) 
         { 
             return Regex.Replace(input, @"[\一-\龥/g]", "aa").Length; 
         } 
 
         /// <summary> 
         /// 調用Regex中IsMatch函數實現一般的正則表達式匹配 
         /// </summary> 
         /// <param name="pattern">要匹配的正則表達式模式。</param> 
         /// <param name="input">要搜索匹配項的字符串</param> 
         /// <returns>如果正則表達式找到匹配項,則為 true;否則,為 false。</returns> 
         public static bool IsMatch(string pattern, string input) 
         { 
             Regex regex = new Regex(pattern); 
             return regex.IsMatch(input); 
         } 
 
         /// <summary> 
         /// 從輸入字符串中的第一個字符開始,用替換字符串替換指定的正則表達式模式的所有匹配項。 
         /// </summary> 
         /// <param name="pattern">模式字符串</param> 
         /// <param name="input">輸入字符串</param> 
         /// <param name="replacement">用於替換的字符串</param> 
         /// <returns>返回被替換後的結果</returns> 
         public static string Replace(string pattern, string input, string replacement) 
         { 
             Regex regex = new Regex(pattern); 
             return regex.Replace(input, replacement); 
         } 
 
         /// <summary> 
         /// 在由正則表達式模式定義的位置拆分輸入字符串。 
         /// </summary> 
         /// <param name="pattern">模式字符串</param> 
         /// <param name="input">輸入字符串</param> 
         /// <returns></returns> 
         public static string[] Split(string pattern, string input) 
         { 
             Regex regex = new Regex(pattern); 
             return regex.Split(input); 
         } 
 
         /// <summary> 
         /// 判斷輸入的字符串是否是合法的IPV6 地址 
         /// </summary> 
         /// <param name="input"></param> 
         /// <returns></returns> 
         public static bool IsIPV6(string input) 
         { 
             string pattern = ""; 
             string temp = input; 
             string[] strs = temp.Split(':'); 
             if (strs.Length > 8) 
             { 
                 return false; 
             } 
             int count = MetarnetRegex.GetStringCount(input, "::"); 
             if (count > 1) 
             { 
                 return false; 
             } 
             else if (count == 0) 
             { 
                 pattern = @"^([\da-f]{1,4}:){7}[\da-f]{1,4}$"; 
 
                 Regex regex = new Regex(pattern); 
                 return regex.IsMatch(input); 
             } 
             else 
             { 
                 pattern = @"^([\da-f]{1,4}:){0,5}::([\da-f]{1,4}:){0,5}[\da-f]{1,4}$"; 
                 Regex regex1 = new Regex(pattern); 
                 return regex1.IsMatch(input); 
             } 
 
         } 
         /* *******************************************************************
         * 1、通過“:”來分割字符串看得到的字符串數組長度是否小於等於8
         * 2、判斷輸入的IPV6字符串中是否有“::”。
         * 3、如果沒有“::”采用 ^([\da-f]{1,4}:){7}[\da-f]{1,4}$ 來判斷
         * 4、如果有“::” ,判斷"::"是否止出現一次
         * 5、如果出現一次以上 返回false
         * 6、^([\da-f]{1,4}:){0,5}::([\da-f]{1,4}:){0,5}[\da-f]{1,4}$
         * ******************************************************************/ 
         /// <summary> 
         /// 判斷字符串compare 在 input字符串中出現的次數 
         /// </summary> 
         /// <param name="input">源字符串</param> 
         /// <param name="compare">用於比較的字符串</param> 
         /// <returns>字符串compare 在 input字符串中出現的次數</returns> 
         private static int GetStringCount(string input, string compare) 
         { 
             int index = input.IndexOf(compare); 
             if (index != -1) 
             { 
                return 1 + GetStringCount(input.Substring(index + compare.Length), compare); 
             } 
             else 
             { 
                 return 0; 
             } 
 
         } 
     } 
 } 
作者:hwt0101

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