使用 RegularExpressions 取得網頁的錨點

2008-03-25

3722
0
ASP.NET

摘要:使用 RegularExpressions 取得網頁的錨點

這陣子在做HTML Editor時
使用者希望可以輸入超連結後，同時還可挑選這超連結的錨點
實作出來後,和大家分享一下 ^^

.aspx檔

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="getHtmlAnchor.aspx.cs" Inherits="getHtmlAnchor" %>

<!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>未命名頁面</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>網址：
        <asp:TextBox ID="TextBox1" runat="server" Width="500px"></asp:TextBox>
        <br />
        <br />
        <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="取得錨點" />
        <asp:Label ID="Label1" runat="server" Text=""></asp:Label>
        <br />
        <asp:ListBox ID="ListBox1" runat="server" Rows="10" Width="500px"></asp:ListBox>
    </div>
    </form>
</body>
</html>

.cs檔

using System;

using System.Collections;

using System.Configuration;

using System.Data;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Net;

using System.IO;

using System.Text.RegularExpressions;

public partial class getHtmlAnchor : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

}

protected void Button1_Click(object sender, EventArgs e)

{

//先將錨點列表清空

ListBox1.Items.Clear();

//判斷網址是否正確

HttpWebRequest request;

HttpWebResponse response;

Stream stream = null;

Boolean isOk = false;

try

{

request = (HttpWebRequest)WebRequest.Create(TextBox1.Text);

response = (HttpWebResponse)request.GetResponse();

stream = response.GetResponseStream();

isOk = true;

Label1.Text = "網址輸入正確";

}

catch (Exception)

{

Label1.Text = "網址輸入不正確，請重新輸入";

//throw;

}

finally

{

request = null;

response = null;

}

//網址輸入正確

if (isOk)

{

//取得輸入網址的內容

string html = new StreamReader(stream).ReadToEnd();

//利用 RegularExpressions 來取得超連結錨點，依序加入錨點列表裡

//<a id="top"/> <a name="top"/> 都是錨點

foreach (Match m in Regex.Matches(html, "(?i)[<](?<tag>\\w+)\\s[^>]*?(?<name>id|name)=['\"](?<url>.*?)[\"'].*?[>]"))

{

if (m.Groups["tag"].ToString().ToLower() == "a")

{

ListBox1.Items.Add(m.Groups["url"].ToString());

}

執行結果

原始碼下載

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