Question

我想从以下HTML解析第二个div：

<div kubedfiuabefiudsabiubfg><div class='post-body entry-content' id='post-body-7494158715135407463' itemprop='articleBody'><div kubedfiuabefiudsabiubfg>

即，此值：<div class='post-body entry-content' id='post-body-7494158715135407463' itemprop='articleBody'>

id可以包含任何数字。

以下是我的尝试：

Regex rgx = new Regex(@"'post-body-\d*'");
var res = rgx.Replace("<div kubedfiuabefiudsabiubfg><div class='post-body entry-content' id='post-body-7494158715135407463' itemprop='articleBody'><div kubedfiuabefiudsabiubfg>", "");

我希望结果为<div kubedfiuabefiudsabiubfg><div kubedfiuabefiudsabiubfg>，但这不是我得到的结果。

Answer 1

如果您100％确定数字前后的文本将始终相同，则可以使用String类的.IndexOf和.Substring方法将字符串分解为多个部分。

string original = @"<div kubedfiuabefiudsabiubfg><div class='post-body entry-content' id='post-body-7494158715135407463' itemprop='articleBody'><div kubedfiuabefiudsabiubfg>"

// IndexOf returns the position in the string where the piece we are looking for starts
int startIndex = original.IndexOf(@"<div class='post-body entry-content' id='post-body-");
// For the endIndex, add the number of characters in the string that you are looking for
int endIndex = original.IndexOf(@"' itemprop='articleBody'>") + 25;

// this substring will retrieve just the inner part that you are looking for
string newString = original.Substring(startIndex, endIndex - startIndex);

// newString should now equal "<div class='post-body entry-content' id='post-body-7494158715135407463' itemprop='articleBody'>"


// or, if you want to just remove the inner part, build a different string like this:
// First, get everything leading up to the startIndex
string divString = original.Substring(0, startIndex);
// then, add everything after the endIndex
divString += original.Substring(endIndex);

// divString should now equal "<div kubedfiuabefiudsabiubfg><div kubedfiuabefiudsabiubfg>"

希望这会有所帮助...

Answer 2

您未获得预期结果的原因是您的正则表达式字符串仅搜索'post-body-\d*'，而不是div标记的其余部分。此外，执行Regex.Replace实际上会替换您要搜索的文本，而不是返回它，因此您最终会获得所有但您正在搜索的文本。

尝试使用Regex.Matches替换@ "<div class='post-body entry-content' id='post-body-\d*' itemprop='articleBody'>"的正则表达式字符串（如果您只关心第一次出现，请Regex.Match），并处理Matches。

例如：

string htmlText = @"<div kubedfiuabefiudsabiubfg><div class='post-body entry-content' id='post-body-7494158715135407463' itemprop='articleBody'><div kubedfiuabefiudsabiubfg>";

Regex rgx = new Regex(@`"<div class='post-body entry-content' id='post-body-\d*' itemprop='articleBody'>");
foreach (Match match in rgx.Matches(htmlText))
{
    // Process matches
    Console.WriteLine(match.ToString());
}

Answer 3

您可以将HTML片段解析为XML片段并直接提取id属性，例如。

var html = "<div kubedfiuabefiudsabiubfg><div class='post-body entry-content' id='post-body-7494158715135407463' itemprop='articleBody'><div kubedfiuabefiudsabiubfg>"
var data = XElement.Parse(html).Element("div").Attribute("id");

C＃中的正则表达式

3 个答案: