用大字符串替换所有regEx匹配 [英] replacing all regEx matches in large string

问题描述

好的我有以下代码，但是当它运行时它不会返回被替换的字符串;

  private   string  ReplaceDescription（ string  description）
 {
  var  newDescription = description.Replace（  / en / products / purpose /，  / en /）; 
  return  newDescription; 
} 
 
  private   string  ReplaceProductDescription（ string  description）
 {
  string  pattern =  @   / en / products / \d {4} / \d {4} \.aspx; 
 Regex regEx =  new 正则表达式（模式）; 
  foreach （匹配匹配  regEx.Matches（description））
 {
  string  matchedValue = match.Value; 
  string  productNumber = System.IO.Path.GetFileNameWithoutExtension（matchedValue）; 
 description.Replace（matchedValue，  newString）; 
} 
 返回说明; 
 
} 

第一种方法工作正常，但第二种方法不会返回带有替换的描述，任何非常感谢帮助。

解决方案

为什么不让正则表达式做替换呢？

  private   string  ReplaceProductDescription（ string  description）
 {
  string  pattern =  @  / EN /产品/（小于？PN1> \d {4}）/（< PN2> \d {4}）\.aspx; 
 Regex regEx =  new 正则表达式（模式）; 
  return  regEx.Replace（description，  newString pn1 here：

{pn1} pn2 here：

{pn2}）;
}

您可能想要预构建 Regex 一次，而不是每次调用

Ok i have the following code, but when it runs it doesn't return the replaced string;

private string ReplaceDescription(string description)
       {
           var newDescription = description.Replace("/en/products/purpose/", "/en/");
           return newDescription;
       }

       private string ReplaceProductDescription(string description)
       {
           string pattern = @"/en/products/\d{4}/\d{4}\.aspx";
           Regex regEx = new Regex(pattern);
           foreach (Match match in regEx.Matches(description))
           {
               string matchedValue = match.Value;
               string productNumber = System.IO.Path.GetFileNameWithoutExtension(matchedValue);
               description.Replace(matchedValue, "newString");
           }
           return description;

       }

The first method works fine, but the second one wont return the description with replacements, any help would be great many thanks.

解决方案

Why not just have the Regex do the replacement?

private string ReplaceProductDescription(string description)
{
    string pattern = @"/en/products/(?<pn1>\d{4})/(?<pn2>\d{4})\.aspx";
    Regex regEx = new Regex(pattern);
    return regEx.Replace(description, "newString pn1 here:

{pn1} pn2 here:

{pn2}"); }

And you probably want to pre-construct the Regex once, instead of on each call.

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