Question

我正在寻找一个RegEx来从URL中提取链接。网址如下：

/redirecturl?u=http://www.abc.com/&amp;tkn=Ue4uhv&amp;ui=fWrQfyg46CADA&amp;scr=SSTYQFjAA&amp;mk=4D6GHGLfbQwETR

我需要从上面的网址中提取链接http://www.abc.com。

我尝试了RegEx：

redirecturl\\?u=(?<link>[^\"]+)&

这样可行，但问题是在第一次出现＆amp;之后它不会截断所有字符。

如果您可以修改RegEx以便我获得链接，那就太棒了。

提前致谢。

Answer 1

redirecturl\\?u=([^\"&]+)

当它到达&或者根本没有&时应截断

Answer 2

如何使用URI class？

示例：

string toParse = "/redirecturl?u=http://www.abc.com/&amp;tkn=Ue4uhv&amp;ui=fWrQfyg46CADA&amp;scr=SSTYQFjAA&amp;mk=4D6GHGLfbQwETR";

// remove "/redirecturl?u="
string urlString = toParse.Substring(15,toParse.Length - 15); 

var url = new Uri(urlString);
var leftPart = url.GetLeftPart(UriPartial.Scheme | UriPartial.Authority);
// leftPart = "http://www.abc.com"

Answer 3

通过\来逃避特殊字符，即匹配/使用 [\ /]

var matchedString = Regex.Match(s,@"[\/]redirecturl[\?]u[\=](?<link>.*)[\/]").Groups["link"];

Answer 4

using System.Text.RegularExpressions;

//  A description of the regular expression:
//  
//  [Protocol]: A named capture group. [\w+]
//      Alphanumeric, one or more repetitions
//  :\/\/
//      :
//      Literal /
//      Literal /
//  [Domain]: A named capture group. [[\w@][\w.:@]+]
//      [\w@][\w.:@]+
//          Any character in this class: [\w@]
//          Any character in this class: [\w.:@], one or more repetitions
//  Literal /, zero or one repetitions
//  Any character in this class: [\w\.?=%&=\-@/$,], any number of repetitions

public Regex MyRegex = new Regex(
      "(?<Protocol>\\w+):\\/\\/(?<Domain>[\\w@][\\w.:@]+)\\/?[\\w\\."+
      "?=%&=\\-@/$,]*",
    RegexOptions.IgnoreCase
    | RegexOptions.CultureInvariant
    | RegexOptions.IgnorePatternWhitespace
    | RegexOptions.Compiled
    );


// Replace the matched text in the InputText using the replacement pattern
 string result = MyRegex.Replace(InputText,MyRegexReplace);

// Split the InputText wherever the regex matches
 string[] results = MyRegex.Split(InputText);

// Capture the first Match, if any, in the InputText
 Match m = MyRegex.Match(InputText);

// Capture all Matches in the InputText
 MatchCollection ms = MyRegex.Matches(InputText);

// Test to see if there is a match in the InputText
 bool IsMatch = MyRegex.IsMatch(InputText);

// Get the names of all the named and numbered capture groups
 string[] GroupNames = MyRegex.GetGroupNames();

// Get the numbers of all the named and numbered capture groups
 int[] GroupNumbers = MyRegex.GetGroupNumbers();

RegEx提取链接

4 个答案: