正則表達式在C中嵌套從UL UL＃

我在我的HTML中有一個嵌套的UL，LI列表。我怎樣才能從ul到ul節點的末尾獲得正則表達式。在這個例子中，我需要獲得2場比賽。正則表達式在C中嵌套從UL UL＃

第一個應該是

<ul> 
    <li>This is First List</li> 
    <li>This is Second List</li> 
    <ul> 
     <li>This is Second UL First List </li> 
     <li>This is Second UL Second List </li> 
    </ul> 
    <li>This is Third List</li> 
</ul>

，第二個應該是

<ul> 
     <li>This is Next List</li> 
     <ul> 
      <li>This is Test </li> 
     </ul> 
     <li>This is Third List</li> 
     <ul> 
      <li>This is Test </li> 
     </ul> 
</ul>

我的HTML代碼：

<html> 
<p> This is First Paragraph </p> 
<ul> 
    <li>This is First List</li> 
    <li>This is Second List</li> 
    <ul> 
     <li>This is Second UL First List </li> 
     <li>This is Second UL Second List </li> 
    </ul> 
    <li>This is Third List</li> 
</ul> 
<p> This is Second Paragraph </p> 

<ul> 
    <li>This is Next List</li> 
    <ul> 
     <li>This is Test </li> 
    </ul> 
    <li>This is Third List</li> 
    <ul> 
     <li>This is Test </li> 
    </ul> 
</ul> 
</html>

來源

2017-04-05 vamsivanka

不要使用正則表達式來解析HTML。請參閱：http://stackoverflow.com/a/1732454/4664094 –

[必備鏈接]（http://stackoverflow.com/a/1732454/2307070） –

您可以嘗試HTML Agility Pack（https：//htmlagilitypack.codeplex .COM）。正如以前的海報所指出的，不使用RegEx。 –

可以匹配嵌套結構與.NET Balancing Groups。該特徵基本上增加了一個堆棧，它可以被推的概念/彈出(<NestedUL>...)和(<-NestedUL>...)，然後經由最後一個條件，其包括只保證失敗的圖案(?(NestedUL)(?!))空先行在圖案的端部爲進行測試：

var input = 
    @"<html> 
    <p> This is First Paragraph </p> 
    <ul> 
     <li>This is First List</li> 
     <li>This is Second List</li> 
     <ul> 
      <li>nested list #1 inside first parent UL</li> 
      <li>This is Second UL Second List </li> 
     </ul> 
     <li>This is Third List</li> 
    </ul> 
    <p> This is Second Paragraph </p> 

    <ul> 
     <li>This is Next List</li> 
     <ul> 
      <li>nested list #1 inside second parent UL</li> 
     </ul> 
     <li>This is Third List</li> 
     <ul> 
      <li>nested list #2 inside second parent UL</li> 
     </ul> 
    </ul> 
    </html>"; 
       var pattern = "<ul>(?:(?<NestedUL><ul>)|(?<-NestedUL></ul>)|.)+?(?(NestedUL)(?!))</ul>"; 
       var matches = Regex.Matches(input, pattern, RegexOptions.Singleline); 
      }

*注意，反覆交替+?的非貪婪量詞 - 如果這是貪婪的，這個模式將愉快地消耗都UL與一根火柴。

來源

2017-04-05 15:28:41 sweaver2112

正則表達式在C中嵌套從UL UL＃

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