php正则函数抓取网页连接(C#基于正则表达式实现获取网页中所有信息的网页抓取类)

　　php正则函数抓取网页连接(C#基于正则表达式实现获取网页中所有信息的网页抓取类)

　　本文文章主要介绍了基于正则表达式获取网页中所有信息的C#网页爬虫类，结合完整示例表格分析C#正则网页爬虫类及使用技巧，有需要的朋友可以参考到以下

　　本文介绍了基于正则表达式的C#网页爬虫类获取网页中所有信息的示例。分享给大家，供大家参考，如下：

　　类的代码：

<p> using System; using System.Data; using System.Configuration; using System.Net; using System.IO; using System.Text; using System.Collections.Generic; using System.Text.RegularExpressions; using System.Threading; using System.Web; using System.Web.UI.MobileControls; /// /// 网页类 /// public class WebPage { #region 私有成员 private Uri m_uri; //url private List m_links; //此网页上的链接 private string m_title; //标题 private string m_html; //HTML代码 private string m_outstr; //网页可输出的纯文本 private bool m_good; //网页是否可用 private int m_pagesize; //网页的大小 private static Dictionary webcookies = new Dictionary();//存放所有网页的Cookie #endregion #region 属性 /// /// 通过此属性可获得本网页的网址，只读 /// public string URL { get { return m_uri.AbsoluteUri; } } /// /// 通过此属性可获得本网页的标题，只读 /// public string Title { get { if (m_title == "") { Regex reg = new Regex(@"(?m)]*>(?(?:\w|\W)*?)]*>", RegexOptions.Multiline | RegexOptions.IgnoreCase); Match mc = reg.Match(m_html); if (mc.Success) m_title = mc.Groups["title"].Value.Trim(); } return m_title; } } public string M_html { get { if (m_html == null) { m_html = ""; } return m_html; } } /// /// 此属性获得本网页的所有链接信息，只读 /// public List Links { get { if (m_links.Count == 0) getLinks(); return m_links; } } /// /// 此属性返回本网页的全部纯文本信息，只读 /// public string Context { get { if (m_outstr == "") getContext(Int16.MaxValue); return m_outstr; } } /// /// 此属性获得本网页的大小 /// public int PageSize { get { return m_pagesize; } } /// /// 此属性获得本网页的所有站内链接 /// public List InsiteLinks { get { return getSpecialLinksByUrl("^http://" + m_uri.Host, Int16.MaxValue); } } /// /// 此属性表示本网页是否可用 /// public bool IsGood { get { return m_good; } } /// /// 此属性表示网页的所在的网站 /// public string Host { get { return m_uri.Host; } } #endregion /// /// 从HTML代码中分析出链接信息 /// /// List private List getLinks() { if (m_links.Count == 0) { Regex[] regex = new Regex[2]; regex[0] = new Regex(@"(?[^]*>", RegexOptions.IgnoreCase); for (int i = 0; i (\w|\W)*?]*>", RegexOptions.Multiline | RegexOptions.IgnoreCase).Replace(m_outstr, ""); m_outstr = new Regex(@"(?m)]*>(\w|\W)*?]*>", RegexOptions.Multiline | RegexOptions.IgnoreCase).Replace(m_outstr, ""); m_outstr = new Regex(@"(?m)]*>(\w|\W)*?]*>", RegexOptions.Multiline | RegexOptions.IgnoreCase).Replace(m_outstr, ""); if (!withLink) m_outstr = new Regex(@"(?m)]*>(\w|\W)*?]*>", RegexOptions.Multiline | RegexOptions.IgnoreCase).Replace(m_outstr, ""); Regex objReg = new System.Text.RegularExpressions.Regex("(]+?>)| ", RegexOptions.Multiline | RegexOptions.IgnoreCase); m_outstr = objReg.Replace(m_outstr, ""); Regex objReg2 = new System.Text.RegularExpressions.Regex("(\\s)+", RegexOptions.Multiline | RegexOptions.IgnoreCase); m_outstr = objReg2.Replace(m_outstr, " "); } return m_outstr.Length > firstN ? m_outstr.Substring(0, firstN) : m_outstr; } #region 公有文法 /// /// 此公有方法提取网页中一定字数的纯文本，包括链接文字 /// /// 字数 /// public string getContext(int firstN) { return getFirstNchar(m_html, firstN, true); } /// /// 此公有方法从本网页的链接中提取一定数量的链接，该链接的URL满足某正则式 /// /// 正则式 /// 返回的链接的个数 /// List public List getSpecialLinksByUrl(string pattern, int count) { if (m_links.Count == 0) getLinks(); List SpecialLinks = new List(); List.Enumerator i; i = m_links.GetEnumerator(); int cnt = 0; while (i.MoveNext() && cnt