c# - 在c#中替换字符串字符

Question

我有一个字符串，它是一个或两个长的句子（超过一个词）。在那个句子中会有一个带有哈希标签的单词，例如#word。这需要替换为*word*.

如果句子是：

Today the weather is very nice #sun

它应该变成：

Today the weather is very nice *sun*

我该怎么做呢？

Answer 1

你可以做一个正则表达式，像这样：

var output = Regex.Replace(input, @"#(\w+)", "*$1*");

Answer 2

你可以试试这个

 string text = "Today the weather is very nice #sun";

 int startindex = text.Indexof('#'); 

 int endindex = text.IndexOf(" ", startIndex);

 text = text.Replace(text.substring(startIndex, 1), "*")
 text = text.Replace(text.substring(endindex, 1), "*")

Answer 3

试试这个：

string theTag = "sun";
string theWord = "sun";

string tag = String.Format("#{0}", theTag);
string word = String.Format("*{0}*", theWord);

string myString = "Today the weather is very nice #sun";
myString = myString.Replace(tag, word);

Answer 4

没有花哨的函数或库，只是常识并解决了您的问题。它支持任意数量的散列词。

为了演示它是如何工作的，我以 ac# 形式创建了 1 个文本框和 1 个按钮，但您可以在控制台或几乎任何东西中使用此代码。

      string output = ""; bool hash = false;
        foreach (char y in textBox1.Text)
        {
            if(!hash) //checks if 'hash' mode activated
            if (y != '#') output += y; //if not # proceed as normal
            else { output += '*'; hash = true; } //replaces # with *
            else if (y != ' ') output += y; // when hash mode activated check for space
            else { output += "* "; hash = false; } // add a * before the space
        } if (hash) output += '*'; // this is needed in case the hashed word ends the sentence
        MessageBox.Show(output);

看哪

Today the weather is very nice #sun 

变成

Today the weather is very nice *sun*

这是相同的代码，但采用方法形式，您可以直接在代码中弹出

   public string HashToAst(string sentence)
    {
        string output = ""; bool hash = false;
        foreach (char y in sentence)
        {
            if (!hash)
                if (y != '#') output += y;
                else { output += '*'; hash = true; } // you can change the # to anything you like here
            else if (y != ' ') output += y;
            else { output += "* "; hash = false; } // you can change the * to something else if you want
        } if (hash) output += '*';                 // and here also
        return output;
    }

演示如何修改下面是一个可定制的版本

    public string BlankToBlank(string sentence,char search,char highlight)
    {
        string output = ""; bool hash = false;
        foreach (char y in sentence)
        {
            if (!hash)
                if (y != search) output += y;
                else { output += highlight; hash = true; }
            else if (y != ' ') output += y;
            else { output += highlight+" "; hash = false; }
        } if (hash) output += highlight;
        return output;
    }

因此，搜索将在单词之前搜索字符，并且突出显示字符将围绕该单词。单词被定义为字符，直到它到达空格或字符串的末尾。