替换字符串中的字符

我创建了一个简单的程序，我想用字符串数组中的其他字符替换一些字符。我创建了一个包含某些字词的字符串数组，我想循环每个单词并检查如果它包含了一些字符，但是当我试图取代什么也没有发生这里是我的代码替换字符串中的字符

  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'); 
       } 



} 
}

来源

2012-05-22 Khaled Mohamed

你忘记了，字符串是不可变的。

words[i].Replace(words[i][j], '1')返回一个带有替换值的新字符串实例。

你有你的引用赋值回到新生成的String对象：

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

来源

2012-05-22 23:11:56

的.Replace操作不发生变异的原始字符串。您必须将结果设置回源变量以应用更改。

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

注意更换适用于整个字符串，因此搜索每一个a，e等逐个字母和调用替换是多余的。你可以这样做：

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

或更好，但使用正则表达式：

来源

2012-05-22 23:12:04 mellamokb

您可以使用Regex.Replace，使在比赛同样的事情更加紧凑和有效的方式。也就是说，这样的：

  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'); 
       }

可以用一个简单的正则表达式替换替换这样的：

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

你甚至可以连锁调用Replace方法是这样的：

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。易于编写和理解，并且更高效。

来源

2012-05-23 01:43:43 JotaBe

替换字符串中的字符

回答

相关问题