用于在括号内查找值的正则表达式

I have a line of code:

我有一行代码：

<link href="<%= Page.ResolveClientUrl("~/Styles/CAR.css") %>" rel="stylesheet" type="text/css" />

I just want to extract ~/Styles/CAR.css from it. Kindly let me know Regex for this. link href tag may contain other syntax as well to refer css. For Ex, <link href="<%= Url.Content("~/Styles/CAR.css") %>" rel="stylesheet" type="text/css" />

我只想从中提取〜/ Styles / CAR.css。请让我知道正则表达式。 link href标签也可以包含其他语法来引用css。对于Ex， ”rel =“stylesheet”type =“text / css”/>

4 个解决方案

#1

Besides that you should'nt parse HTML with regex, I'd go for

除此之外你不应该用正则表达式解析HTML，我会去

\(\"(.+)\"\)

as your regex. Simply extract anything between (" and ").

作为你的正则表达式。只需在（“和”）之间提取任何内容。

For example:

例如：

string strRegex = @"\(\""(.+)\""\)";
Regex myRegex = new Regex(strRegex, RegexOptions.None);
string strTargetString = @"<link href=""<%= Page.ResolveClientUrl(""~/Styles/CAR.css"") %>"" rel=""stylesheet"" type=""text/css"" />";

foreach (Match myMatch in myRegex.Matches(strTargetString))
{
  if (myMatch.Success)
  {
    // Add your code here
  }
}

(example code taken from http://regexhero.net/tester/)

（示例代码来自http://regexhero.net/tester/）

If there will be only one occurence of <link href=""<%= Page.ResolveClientUrl(""~/Styles/CAR.css"") %>"" rel=""stylesheet"" type=""text/css"" /> or you want to get only the first occurence, then you can get rid of the for-loop and use:

如果只出现 “”rel =“”stylesheet“”type =“”text / css“”/>或者你想只获得第一次出现，那么你可以摆脱for循环并使用：

string strRegex = @"\(\""(.+)\""\)";
Regex myRegex = new Regex(strRegex, RegexOptions.None);
string strTargetString = @"<link href=""<%= Page.ResolveClientUrl(""~/Styles/CAR.css"") %>"" rel=""stylesheet"" type=""text/css"" />";

Match myMatch = myRegex.Match(strTargetString);

The difference here is using Regex.Matches(string) (which returns a MatchCollection; every matched occurence) vs Regex.Match(string) (which returns a single Match; the first matched occurence only).

这里的区别在于使用Regex.Matches（字符串）（返回MatchCollection;每个匹配的出现）vs Regex.Match（字符串）（返回单个匹配;仅第一个匹配的出现）。

#2

I suggest you to use HtmlAgilityPack (available from NuGet) for HTML parsing. Getting href attribute value will look like:

我建议你使用HtmlAgilityPack（可从NuGet获得）进行HTML解析。获取href属性值将如下所示：

HtmlDocument doc = new HtmlDocument();
doc.LoadHtml(stringWithHtml);
var link = doc.DocumentNode.SelectSingleNode("//link[@href]");
var href = link.Attributes["href"].Value;

Then you can extract ~/Styles/CAR.css from content of attribute. Regex is good here, but you also can avoid it:

然后你可以从属性的内容中提取〜/ Styles / CAR.css。正则表达式在这里很好，但你也可以避免它：

int startIndex = href.IndexOf('"');
int endIndex = href.LastIndexOf('"');
var result = href.Substring(startIndex + 1, endIndex - startIndex - 1);
// ~/Styles/CAR.css

Extracting path with regex will look like

用正则表达式提取路径看起来像

var match = Regex.Match(href, @"ResolveClientUrl\(""(.*)""\)");
if (match.Success)
    result = match.Groups[1].Value;

#3

use this:

用这个：

/\(([^\)]*)\)/

Tested with perl:

用perl测试：

> cat temp
<link href="<%= Page.ResolveClientUrl("~/Styles/CAR.css") %>" rel="stylesheet" type="text/css" />
> perl -lne 'print $1 if(/\(([^\)]*)\)/)' temp
"~/Styles/CAR.css"
>

#4

”rel =“stylesheet”type =“text / css”/>

For quick regex we can use the information inside the quotes inside parentheses (("~/Styles/CAR.css") ) and use that info to group it into one one.

对于快速正则表达式，我们可以使用括号内的引号内的信息（（“〜/ Styles / CAR.css”））并使用该信息将其分组为一个。

Escaping the parentheses one quick regex would be

逃避括号一个快速正则表达式

“（。* />）

In the above regex there are two groups. The first matched group would give us the required information i.e. ~/Styles/CAR.css.

在上面的正则表达式中有两组。第一个匹配的组将向我们提供所需的信息，即〜/ Styles / CAR.css。

You can check it in http://regexpal.com/ and experiment with other patterns.

您可以在http://regexpal.com/中查看它并尝试其他模式。

#1