字符串查找和替换

Question

我有一个像

string text="~aaa~bbb~ccc~bbbddd"; 

字符串输入值将是：BBB

所以在上面的字符串我要删除值“〜BBB”

结果字符串应该是

text="~aaa~ccc~bbbddd"; 

Answer 1

我不知道什么是你想做的事，但如果我已经有了它，你可以这样做：

private string ReplaceFirstOccurrence(string Source, string Find, string Replace) 
{ 
int Place = Source.IndexOf(Find); 
string result = Source.Remove(Place, Find.Length).Insert(Place, Replace); 
return result; 
} 

var result =ReplaceFirstOccurrence(text,"~"+input,""); 

Answer 2

一种方法是：

string text = "~aaa~bbb~ccc~bbbddd"; 
string newStr = string.Join("~", text.Split('~').Where(r => r != "bbb")); 

但是，如果性能是考虑再考虑到一些其他的解决办法

Answer 3

这应该做的伎俩：

string searchValue = "bbb"; 
text = text.Replace(String.Format("~{0}~", searchValue), "~"); 

一定要搜索对于结尾〜字符，否则你也将替换〜bbbddd的一部分。

Answer 4

您可以使用正则表达式@ “\ bMYWORDTOREPLACE \ B” 在C＃中，这将是...

using System.Text.RegularExpressions; 

myString = Regex.Replace(myString, @"\bbbb\b", "", RegexOptions.IgnoreCase); 

Answer 5

像这样

string str = "~rajeev~ravi"; 
string strRemove = "rajeev"; 
string strNew =str.Replace("~"+strRemove ,""); 

Answer 6

public static string Replace(this String str, char[] chars, string replacement) 
    { 
     StringBuilder output = new StringBuilder(str.Length); 
     bool replace = false; 
     if (chars.Length - 1 < 1) 
     { 
      for (int i = 0; i < str.Length; i++) 
      { 

       char c = str[i]; 
       replace = false; 
       // int val = Regex.Matches(ch.ToString(), @"[a-zA-Z]").Count; 


       for (int j = 0; j < chars.Length; j++) 
       { 
        if (chars[j] == c) 
        { 
         replace = true; 

         break; 

        } 

       } 

       if (replace) 
        output.Append(replacement); 
       else 
        output.Append(c); 
      } 
     } 
     else 
     { 

      int j = 0; 
      int truecount = 0; 
       char c1 = '\0'; 
       for (int k = 0; k < str.Length; k++) 
       { 
        c1 = str[k]; 

        if (chars[j] == c1) 
        { 
         replace = true; 
         truecount ++; 


        } 

        else 
        { 
         truecount = 0; 
         replace = false; 
         j = 0; 
        } 
        if(truecount>0) 
        { 
         j++; 
        } 

        if (j > chars.Length-1) 
        { 
         j = 0; 
        } 

        if (truecount == chars.Length) 
        { 
         output.Remove(output.Length - chars.Length+1, chars.Length-1); 
         // output.Remove(4, 2); 
         if (replace) 
          output.Append(replacement); 
         else 
          output.Append(c1); 
        } 
        else 
        { 
         output.Append(c1); 
        } 


       } 

     } 


     return output.ToString(); 
    } 


static void Main(string[] args) 
{ 

    Console.WriteLine("Enter a word"); 
    string word = (Console.ReadLine()); 

    Console.WriteLine("Enter a word to find"); 
    string find = (Console.ReadLine()); 

    Console.WriteLine("Enter a word to Replace"); 
    string Rep = (Console.ReadLine()); 

    Console.WriteLine(Replace(word, find.ToCharArray(), Rep)); 
    Console.ReadLine(); 

} 

}

Answer 7

好，你可以做这样的事情。
（你只需要输入 'BBB'）

string text = "~aaa~bbb~ccc~bbbddd"; 
string input = "bbb";     

string output = text.Replace("~" + input + "~", "~"); 
Console.WriteLine(output); 

输出：〜AAA〜CCC〜bbbddd