C# 使用正则表达式获取多个 HTML 标签之间的文本
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Using regex to get text between multiple HTML tags
提问by Ben
Using regex, I want to be able to get the text between multiple DIV tags. For instance, the following:
使用正则表达式，我希望能够在多个 DIV 标签之间获取文本。例如，以下内容：
<div>first html tag</div>
<div>another tag</div>
Would output:
会输出：
first html tag
another tag
The regex pattern I am using only matches my last div tag and misses the first one. Code:
我使用的正则表达式模式只匹配我的最后一个 div 标签而错过了第一个。代码：
static void Main(string[] args)
{
string input = "<div>This is a test</div><div class=\"something\">This is ANOTHER test</div>";
string pattern = "(<div.*>)(.*)(<\/div>)";
MatchCollection matches = Regex.Matches(input, pattern);
Console.WriteLine("Matches found: {0}", matches.Count);
if (matches.Count > 0)
foreach (Match m in matches)
Console.WriteLine("Inner DIV: {0}", m.Groups[2]);
Console.ReadLine();
}
Output:
输出：
Matches found: 1
找到匹配项：1
Inner DIV: This is ANOTHER test
内部 DIV：这是另一个测试
回答by coolmine
Replace your pattern with a non greedy match
用非贪婪匹配替换您的模式
static void Main(string[] args)
{
string input = "<div>This is a test</div><div class=\"something\">This is ANOTHER test</div>";
string pattern = "<div.*?>(.*?)<\/div>";
MatchCollection matches = Regex.Matches(input, pattern);
Console.WriteLine("Matches found: {0}", matches.Count);
if (matches.Count > 0)
foreach (Match m in matches)
Console.WriteLine("Inner DIV: {0}", m.Groups[1]);
Console.ReadLine();
}
回答by Mayman
First of all remember that in the HTML file you will have a new line symbol("\n"), which you have not included in the String which you are using to check your regex.
首先请记住，在 HTML 文件中，您将有一个换行符（“\n”），您没有将其包含在用于检查正则表达式的字符串中。
Second by taking you regex:
其次是带你正则表达式：
((<div.*>)(.*)(<\/div>))+ //This Regex will look for any amount of div tags, but it must see at least one div tag.
((<div.*>)(.*)(<\/div>))* //This regex will look for any amount of div tags, and it will not complain if there are no results at all.
Also a good place to look for this sort of information:
也是寻找此类信息的好地方：
http://www.regular-expressions.info/reference.html
http://www.regular-expressions.info/reference.html
http://www.regular-expressions.info/refadv.html
http://www.regular-expressions.info/refadv.html
Mayman
梅曼
回答by Tom Jacques
The short version is that you cannot do this correctly in all situations. There will always be cases of valid HTML for which a regular expression will fail to extract the information you want.
简而言之，您无法在所有情况下都正确执行此操作。总会有一些有效的 HTML 的情况下，正则表达式将无法提取您想要的信息。
The reason is because HTML is a context free grammar which is a more complex class than a regular expression.
原因是因为 HTML 是一种上下文无关文法，它是一个比正则表达式更复杂的类。
Here's an example -- what if you have multiple stacked divs?
这是一个例子——如果你有多个堆叠的 div 怎么办？
<div><div>stuff</div><div>stuff2</div></div>
The regexes listed as other answers will grab:
作为其他答案列出的正则表达式将抓取：
<div><div>stuff</div>
<div>stuff</div>
<div>stuff</div><div>stuff2</div>
<div>stuff</div><div>stuff2</div></div>
<div>stuff2</div>
<div>stuff2</div></div>
because that's what regular expressions do when they try to parse HTML.
因为这就是正则表达式在尝试解析 HTML 时所做的事情。
You can't write a regular expression that understands how to interpret all of the cases, because regular expressions are incapable of doing so. If you are dealing with a very specific constrained set of HTML, it may be possible, but you should keep this fact in mind.
你不能写出一个理解如何解释所有情况的正则表达式，因为正则表达式不能这样做。如果您正在处理一组非常具体的受约束的 HTML，这是可能的，但您应该记住这一事实。
More information: https://stackoverflow.com/a/1732454/2022565
回答by Craig
Have you looked at the Html Agility Pack(see https://stackoverflow.com/a/857926/618649)?
您是否查看过Html Agility Pack（参见https://stackoverflow.com/a/857926/618649）？
CsQueryalso looks pretty useful (basically use CSS selector-style syntax to get the elements). See https://stackoverflow.com/a/11090816/618649.
CsQuery看起来也非常有用（基本上使用 CSS 选择器样式的语法来获取元素）。请参阅https://stackoverflow.com/a/11090816/618649。
CsQuery is basically meant to be "jQuery for C#," which is pretty much the exact search criteria I used to find it.
CsQuery 基本上是“用于 C# 的 jQuery”，这几乎是我用来查找它的确切搜索条件。
If you could do this in a web browser, you could easily use jQuery, using syntax similar to $("div").each(function(idx){ alert( idx + ": " + $(this).text()); }(only you would obviously output the result to the log, or the screen, or make a web service call with it, or whatever you need to do with it).
如果您可以在 Web 浏览器中执行此操作，则可以轻松地使用 jQuery，使用类似于$("div").each(function(idx){ alert( idx + ": " + $(this).text()); }（只有您显然会将结果输出到日志或屏幕，或使用它进行 Web 服务调用，或您需要的任何内容）用它）。
回答by Tri Nguyen Dung
I think this code should work:
我认为这段代码应该有效：
string htmlSource = "<div>first html tag</div><div>another tag</div>";
string pattern = @"<div[^>]*?>(.*?)</div>";
MatchCollection matches = Regex.Matches(htmlSource, pattern, RegexOptions.IgnoreCase | RegexOptions.Singleline);
ArrayList l = new ArrayList();
foreach (Match match in matches)
{
l.Add(match.Groups[1].Value);
}
回答by Mehdi Dehghani
As other guys didn't mention HTML tags with attributes, here is my solution to deal with that:
正如其他人没有提到的HTML tags with attributes，这是我的解决方案：
// <TAG(.*?)>(.*?)</TAG>
// Example
var regex = new System.Text.RegularExpressions.Regex("<h1(.*?)>(.*?)</h1>");
var m = regex.Match("Hello <h1 style='color: red;'>World</h1> !!");
Console.Write(m.Groups[2].Value); // will print -> World
回答by Partha Mondal
I hope below regex will work:
我希望下面的正则表达式会起作用：
<div.*?>(.*?)<*.div>
You will get your desired output
你会得到你想要的输出
This is a test This is ANOTHER test
这是一个测试 这是另一个测试
