匹配的正则表达式URL编码链接C＃

Question

我有一个包含一些链接

<SupportingDocs> 
<LinkedFile>http://llcorp/ll/lljomet.dll/open/864606</LinkedFile> 
<LinkedFile>http://llcorp/ll/lljomet.dll/open/1860632</LinkedFile> 
<LinkedFile>%20http%3A%2F%2Fllenglish%2Fll%2Fll.exe%2Fopen%2F927515</LinkedFile> 
<LinkedFile>%20http%3A%2F%2Fllenglish%2Fll%2Fll.exe%2Fopen%2F973783</LinkedFile> 
</SupportingDocs> 

我使用的是正则表达式的XML文件“\ < [^ \ <>] +>（：HTTPS：// | [>] + \ </[^ \ <>] +>“并使用c＃var matches = MyParser.Matches(FormXml); 但它匹配前两个链接，但不匹配编码的链接。

如何使用RegEx匹配URL编码的链接？

Answer 1

下面是一个可能有用的片段。我真的质疑你是否使用最好的方法，所以我做了一些假设（也许你只是没有给出足够的细节）。

我将xml解析为XmlDocument以在代码中使用它。相关标签（“LinkedFile”）被拉出。每个标签被解析为Uri。如果失败了，它就会失效并且再次尝试解析。最后将是包含正确解析的url的字符串列表。如果你真的需要，你可以在这个集合上使用你的正则表达式。

// this is for the interactive console 
#r "System.Xml.Linq" 
using System.Xml; 
using System.Xml.Linq; 

// sample data, as provided in the post. 
string rawXml = "<SupportingDocs><LinkedFile>http://llcorp/ll/lljomet.dll/open/864606</LinkedFile><LinkedFile>http://llcorp/ll/lljomet.dll/open/1860632</LinkedFile><LinkedFile>%20http%3A%2F%2Fllenglish%2Fll%2Fll.exe%2Fopen%2F927515</LinkedFile><LinkedFile>%20http%3A%2F%2Fllenglish%2Fll%2Fll.exe%2Fopen%2F973783</LinkedFile></SupportingDocs>"; 
var xdoc = new XmlDocument(); 
xdoc.LoadXml(rawXml) 

// will store urls that parse correctly 
var foundUrls = new List<String>(); 

// temp object used to parse urls 
Uri uriResult; 

foreach (XmlElement node in xdoc.GetElementsByTagName("LinkedFile")) 
{ 
    var text = node.InnerText; 

    // first parse attempt 
    var result = Uri.TryCreate(text, UriKind.Absolute, out uriResult); 

    // any valid Uri will parse here, so limit to http and https protocols 
    // see https://stackoverflow.com/a/7581824/1462295 
    if (result && (uriResult.Scheme == Uri.UriSchemeHttp || uriResult.Scheme == Uri.UriSchemeHttps)) 
    { 
     foundUrls.Add(uriResult.ToString()); 
    } 
    else 
    { 
     // The above didn't parse, so check if this is an encoded string. 
     // There might be leading/trailing whitespace, so fix that too 
     result = Uri.TryCreate(Uri.UnescapeDataString(text).Trim(), UriKind.Absolute, out uriResult); 

     // see comments above 
     if (result && (uriResult.Scheme == Uri.UriSchemeHttp || uriResult.Scheme == Uri.UriSchemeHttps)) 
     { 
      foundUrls.Add(uriResult.ToString()); 
     } 
    } 
} 

// interactive output: 
> foundUrls 
List<string>(4) { "http://llcorp/ll/lljomet.dll/open/864606", "http://llcorp/ll/lljomet.dll/open/1860632", "http://llenglish/ll/ll.exe/open/927515", "http://llenglish/ll/ll.exe/open/973783" }