替換字符串中的字符

我創建了一個簡單的程序，我想用字符串數組中的其他字符替換一些字符。我創建了一個包含某些字詞的字符串數組，我想循環每個單詞並檢查如果它包含了一些字符，但是當我試圖取代什麼也沒有發生這裏是我的代碼替換字符串中的字符

  string x = ""; 
      x = "Script friends above about type=text/javascript>BBC.adverts.writeleaderboardtrue) all </script>friends,eating,khaled,khaled,khaled"; 
char[] delimiterChars = { ' ', ',', '.', ':', '\t', ':', '$', '=', ';', '<', '>', '!', ';', ']', '[', '"', 
            '/','=','-','?'}; 
string[] words = x.Split(delimiterChars); 
      for (int j = 0; j < words.Length; j++) 
      { 
       words[j] = words[j].ToLower(); 
      } 
for (int i = 0; i < words.Length; i++) 
      { 
       for (int j = 0; j < words[j].Length; j++) 
       { 

        if (words[i][j]=='a'||words[i][j]=='e'||words[i][j]=='i'||words[i][j]=='o'||words[i][j]=='u' 
         ||words[i][j]=='h'||words[i][j]=='w'||words[i][j]=='y') 
        { 
         words[i].Replace(words[i][j],'0'); 
        } 
        else if (words[i][j] == 'b' || words[i][j] == 'f' || words[i][j] == 'p' || words[i][j] == 'v') 
        { 
         words[i].Replace(words[i][j], '1'); 
        } 

        else if (words[i][j] == 'c' || words[i][j] == 'g' || words[i][j] == 'j' || words[i][j] == 'k' 
        || words[i][j] == 'q' || words[i][j] == 's' || words[i][j] == 'x' || words[i][j] == 'z') 
       { 
        char xx = words[i][j]; 
        words[i].Replace(xx, '2'); 
        Console.WriteLine(words[i]); 
       } 
       else if (words[i][j] == 'd' || words[i][j] == 't') 
       { 
        words[i].Replace(words[i][j], '3'); 
       } 
       else if (words[i][j] == 'l') 
       { 
        words[i].Replace(words[i][j], '4'); 
       } 
       else if (words[i][j] == 'm' || words[i][j] == 'n') 
       { 
        words[i].Replace(words[i][j], '5'); 
       } 
       else if (words[i][j] == 'r') 
       { 
        words[i].Replace(words[i][j], '6'); 
       } 



} 
}

來源

2012-05-22 Khaled Mohamed

你忘記了，字符串是不可變的。

words[i].Replace(words[i][j], '1')返回一個帶有替換值的新字符串實例。

你有你的引用賦值回到新生成的String對象：

words[i] = words[i].Replace(words[i][j], '1');

來源

2012-05-22 23:11:56

的.Replace操作不發生變異的原始字符串。您必須將結果設置回源變量以應用更改。

words[i] = words[i].Replace(words[i][j], '0');

注意更換適用於整個字符串，因此搜索每一個a，e等逐個字母和調用替換是多餘的。你可以這樣做：

words[i] = words[i].Replace('a', '0'); 
words[i] = words[i].Replace('e', '0'); 
// etc..

或更好，但使用正則表達式：

來源

2012-05-22 23:12:04 mellamokb

您可以使用Regex.Replace，使在比賽同樣的事情更加緊湊和有效的方式。也就是說，這樣的：

  for (int j = 0; j < words[j].Length; j++) 
      { 

       if (words[i][j]=='a'||words[i][j]=='e'||words[i][j]=='i'||words[i][j]=='o'||words[i][j]=='u' 
        ||words[i][j]=='h'||words[i][j]=='w'||words[i][j]=='y') 
       { 
        words[i].Replace(words[i][j],'0'); 
       }

可以用一個簡單的正則表達式替換替換這樣的：

Regex re0 = new Regex("[aeiouhwy]"); // match any of this chras 
    string changedWord = re0.Replace(word,"0");

你甚至可以連鎖調用Replace方法是這樣的：

Regex re0 = new Regex("[aeiouhwy]"); // match any of this chras 
    Regex re1 = new Regex("[bfpv]"); 
    string changedWord = re0.Replace(word,"0"); 
    changedWord = re1.Replace(changedWord,"1")

等。易於編寫和理解，並且更高效。

來源

2012-05-23 01:43:43 JotaBe

替換字符串中的字符

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