ASP.NET利用正規表達式(Regular Expression)取得網頁內容的超連結Url

2008-06-30

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ASP.NET

最近有人討論到這個問題...小弟去找了一個Regular Expression,,還不錯用..
雖然不一定很正確的取出Url,但命中率我覺得很高了...
就用範例來介紹,分享給大家呀..

最近有人討論到這個問題...小弟去找了一個Regular Expression,,還不錯用..

雖然不一定很正確的取出Url,但命中率我覺得很高了...

就用範例來介紹,分享給大家呀..

asp.net(c#)

GetUrl.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="GetUrl.aspx.cs" Inherits="GetUrl" ValidateRequest="false" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>GetUrl</title> </head> <body> <form id="form1" runat="server"> <div> <asp:TextBox ID="TextBox2" runat="server" Width="573px">(?<HTML><a[^>]*href\s*=\s*[\"\']?(?<HRef>[^"'>\s]*)[\"\']?[^>]*>(?<Title>[^<]+|.*?)?</a\s*>)</asp:TextBox><br /> <asp:Label ID="Label1" runat="server" Text="Url"></asp:Label> <asp:TextBox ID="TextBox1" runat="server" Width="340px">http://regexlib.com/RETester.aspx?regexp_id=984</asp:TextBox> <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="GetHtmlUrl" /><br /> <asp:GridView ID="GridView1" runat="server"> </asp:GridView> </div> </form> </body> </html>

GetUrl.aspx.cs

using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Net; using System.Text.RegularExpressions; using System.Collections.Generic; public partial class GetUrl : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void Button1_Click(object sender, EventArgs e) { WebClient client = new WebClient(); string htmlCode = client.DownloadString(this.TextBox1.Text); //(?<HTML><a[^>]*href\s*=\s*[\"\']?(?<HRef>[^"'>\s]*)[\"\']?[^>]*>(?<Title>[^<]+|.*?)?</a\s*>) MatchCollection mc = Regex.Matches(htmlCode, this.TextBox2.Text); List<Href> list = new List<Href>(); foreach (Match match in mc) { list.Add(new Href(match.Groups[1].Value, match.Groups[2].Value, match.Groups[3].Value)); } this.GridView1.DataSource = list; this.GridView1.DataBind(); } } public class Href { private string _Tag; private string _Url; private string _Title; public Href(string Tag, string Url, string Title) { _Tag = Tag; _Url = Url; _Title = Title; } public string Tag { set { _Tag = value; } get { return _Tag; } } public string Url { set { _Url = value; } get { return _Url; } } public string Title { set { _Title = value; } get { return _Title; } } }

執行結果:

參考網址:

http://regexlib.com/RETester.aspx?regexp_id=984
http://forums.msdn.microsoft.com/zh-TW/regexp/thread/c85fc09a-0760-4a4b-b980-168c2acda953/

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