如何用单套引号替换双套引号

问题描述

我正在解析一些清单文件，需要清理它们，然后才能将它们加载为XML。因此，这些文件是无效的XML文件。

请考虑以下代码段：

<assemblyIdentity name=""Microsoft.Windows.Shell.DevicePairingFolder"" processorArchitecture=""amd64"" version=""5.1.0.0"" type="win32" />

有几个双引号""的实例，我想用单引号"代替。

本质上，示例将转换为

<assemblyIdentity name="Microsoft.Windows.Shell.DevicePairingFolder" processorArchitecture="amd64" version="5.1.0.0" type="win32" />

我认为正则表达式将是最好的方法，但这不是我的强项。

应注意以下几点：

• 清单是多行字符串（本质上只是XML文档）
• 在文档中类似processorArchitecture=""的东西是有效的，因此为什么不宜使用简单的string.Replace调用。

解决方法

使用

(\w+=)""(.*?)""(?=\s+\w+=|$)

替换为$1"$2"。参见proof。

说明

--------------------------------------------------------------------------------
  (                        group and capture to \1:
--------------------------------------------------------------------------------
    \w+                      word characters (a-z,A-Z,0-9,_) (1 or
                             more times (matching the most amount
                             possible))
--------------------------------------------------------------------------------
    =                        '='
--------------------------------------------------------------------------------
  )                        end of \1
--------------------------------------------------------------------------------
  ""                       '""'
--------------------------------------------------------------------------------
  (                        group and capture to \2:
--------------------------------------------------------------------------------
    .*?                      any character except \n (0 or more times
                             (matching the least amount possible))
--------------------------------------------------------------------------------
  )                        end of \2
--------------------------------------------------------------------------------
  ""                       '""'
--------------------------------------------------------------------------------
  (?=                      look ahead to see if there is:
--------------------------------------------------------------------------------
    \s+                      whitespace (\n,\r,\t,\f,and " ") (1
                             or more times (matching the most amount
                             possible))
--------------------------------------------------------------------------------
    \w+                      word characters (a-z,_) (1 or
                             more times (matching the most amount
                             possible))
--------------------------------------------------------------------------------
    =                        '='
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
    $                        before an optional \n,and the end of
                             the string
--------------------------------------------------------------------------------
  )                        end of look-ahead

C# example：

using System;
using System.Text.RegularExpressions;

public class Example
{
    public static void Main()
    {
        string pattern = @"(\w+=)""""(.*?)""""(?=\s+\w+=|$)";
        string substitution = @"$1""$2""";
        string input = @"<assemblyIdentity name=""""Microsoft.Windows.Shell.DevicePairingFolder"""" processorArchitecture=""""amd64"""" version=""""5.1.0.0"""" type=""win32"" />";
        
        Regex regex = new Regex(pattern);
        string result = regex.Replace(input,substitution);
        Console.Write(result);
    }
}

,

两种方式：

1. 字符串替换

var newString = s.Replace("\"\"","\"");

1. 正则表达式。

string checkStringForDoubleQuotes = @"""";
string newString  = Regex.Replace(s,checkStringForDoubleQuotes,@""");

更新后：

您的正则表达式是https://regex101.com/r/xZUtUf/1/

""(?=\w)|(?<=\w)""

string s = "test=\"\" test2=\"\"assdasad\"\"";
string checkStringForDoubleQuotes = "\"\"(?=\\w)|(?<=\\w)\"\"";
string newString  = Regex.Replace(s,"\"");
Console.WriteLine(newString);
// test="" test2="assdasad"

https://dotnetfiddle.net/FmWXUa

,

使用十六进制转义符将引号用作\x22，以便于使用。这会将每个连续的""替换为"。

 Regex.Replace(data,@"(\x22\x22)","\x22")