如何使用正则表达式替换C＃中的一部分字符串？

Question

I have little experince in C# and regex, but I need try this this logic:

 string replacedText = Regex.Replace(
     "ssdf bonnets sdf sdf sdf ", 
     @"(?i)^(.+ )?(bonnet)(s?)( .+)?$", 
     "$1hood$3$4"
 );

The above code was an answer to question in stackoverflow:

Replacing a part of string while keeping the rest intact? instead of detecting just the word (bonnet) I want to replace multiple values for example if it finds "f" or "b" or "s" it will be replaced by "a"?

for example if the input "ahfbsdrts stb" the output wll be "ahaaadrta ata"

Answer 1

为什么不只使用对String.Replace的多次调用？

Answer 2

Try this:

using System;
using System.Text.RegularExpressions;

public class Example
{
 public static void Main()
 {
  string input = "ssdf bonnets sdf sdf sdf ";
  string pattern_1 = "f";
  string replacement = "a";
  Regex rgx_1 = new Regex(pattern_1);
  string result = rgx_1.Replace(input, replacement);
  string pattern_2 = "b";
  Regex rgx_2 = new Regex(pattern_2);
  result = rgx_2.Replace(result, replacement);
  string pattern_3 = "s";
  Regex rgx_3 = new Regex(pattern_3);
  result = rgx_3.Replace(result, replacement);
  Console.WriteLine("Original String: {0}", input);
  Console.WriteLine("Replacement String: {0}", result);                             
 }
}

Answer 3

I post another option for short code.

Please see http://forums.asp.net/t/1185961.aspx/1

Something like string temp = Regex.Replace(input, @"[fbs]", "a");