如何用正则表达式提取URL中的参数名称与值？

Question

string urlStr="pnumber=15012345678&name=！@#￥%……&*（）《》？“|}{阿斯蒂芬12345678&&gender=1&relation=1"

有4个参数及对应的值：
pnumber=15012345678
name=！@#￥%……&*（）《》？“|}{阿斯蒂芬12345678&
gender=1
relation=1

用正则表达式匹配代码：

NameValueCollection nameValueCollection =new NameValueCollection ();

Regex regex = new Regex(@"(^|&)?(\w+)=([^&]+)(&|$)?", RegexOptions.Compiled);
MatchCollection matchCollection = regex.Matches(urlStr);
foreach (Match match in matchCollection)
{
     nameValueCollection.Add(match.Result("$2").ToLower(), match.Result("$3"));
}

匹配后却是如下结果，其中name的值为什么只提取了部分内容：

pnumber=15012345678
name=！@#￥%……
gender=1
relation=1

如何解决？

Answer 1

可以用URI类

Use System.URI class

The Query property of the URI class returns the entire query as a string

Uri bUri = new Uri("http://somedomain.com/website/webpage.aspx?token=123456&language=English");

var query = bUri.Query.Replace("?", "");

Now query will have the string value "token=123456&language=English"

Then use LINQ to produce a Dictionary from the query attributes

var queryValues = query.Split('&').Select(q => q.Split('='))
                   .ToDictionary(k => k[0], v => v[1]);

You can then access the values as

queryValues["token"]

which will give you 123456

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专注于.NET ERP/CRM开发框架，C/S架构，SQL Server + ORM(LLBL Gen Pro) + Infragistics WinForms

Answer 2

.NET已经有内置方法

string uri = ...;
string queryString = new System.Uri(uri).Query;
var queryDictionary = System.Web.HttpUtility.ParseQueryString(queryString);

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专注于.NET ERP/CRM开发框架，C/S架构，SQL Server + ORM(LLBL Gen Pro) + Infragistics WinForms

Answer 3

.NET已经有内置方法

string uri = ...;
string queryString = new System.Uri(uri).Query;
var queryDictionary = System.Web.HttpUtility.ParseQueryString(queryString);

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专注于.NET ERP/CRM开发框架，C/S架构，SQL Server + ORM(LLBL Gen Pro) + Infragistics WinForms

感谢回复！

取参数的目的是把各参数值转义后再组合成完成的URL，进行HttpWebRequest 请求。

Uri类中有个Uri.EscapeUriString()方法可以做到这一点，但是无法对参数值进行完全转义。只能提取各参数值，通过Uri.EscapeDataString()进行转义后再组合成完整的URL。

这么做太笨了，有其他好方法？

Answer 4

你好,

你这样的字符串，没有办法做。我建议的做法是，在传参数的时候把值中含有= 和& 用其他的字符代替，或者先Encode 一下在传值。

Best regards,

Zhanglong

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