正则表达式过滤HTML、JS、CSS 主要是⽤来提取html页⾯内容时使⽤。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Net;
using System.Net.NetworkInformation;
using System.Net.Sockets;
using System.Threading;
using System.Text.RegularExpressions;
namespace HtmlRegex
{
public class BaseRegex
{
WebClient web = new WebClient();
public void DeBug(string path,int encoding,string content)
{
Encoding encods;
if (encoding == 1)
encods = Encoding.UTF8;
else
encods = Encoding.Default;
StreamWriter sw = new StreamWriter(path,true ,encods);
sw.WriteLine(content);
sw.Flush();
sw.Close();
}
public string getPageContent(string url, int encoding)
{
byte[] buff = web.DownloadData(url);
if (encoding == 1)
{
return Encoding.UTF8.GetString(buff);
}
js中文正则表达式return Encoding.Default.GetString(buff);
}
public string checkHtml(string html)
{
//过滤JS和CSS
Regex regex1 = new Regex(@"\<script.*?\>.+?\</script\>", RegexOptions.Singleline | RegexOptions.IgnoreCase);            Regex regex2 = new Regex(@"\<style.*?\>.+?\</style\>", RegexOptions.Singleline | RegexOptions.IgnoreCase);            Regex regex3 = new Regex(@"\<script.*?\>.*?\</script\>", RegexOptions.Singleline | RegexOptions.IgnoreCase);            Regex regex4 = new Regex(@"\<style.*?\>.*?\</style\>", RegexOptions.Singleline | RegexOptions.IgnoreCase);
Regex regex5 = new Regex(@"\<.*?\>", RegexOptions.Singleline | RegexOptions.IgnoreCase);
Regex regex6 = new Regex(@"&\S{2,}?;", RegexOptions.Singleline | RegexOptions.IgnoreCase);
Regex regex7 = new Regex(@"\<!\-\-.+?\-\-\>", RegexOptions.Singleline | RegexOptions.IgnoreCase);
Regex regex8 = new Regex(@"[\r\n]{2,}", RegexOptions.Singleline | RegexOptions.IgnoreCase);
//HTML标签包括⾃闭和标签
//Regex regex9 = new Regex(@"<(.*)(.*)>.*<\/\1>|<(.*) \/>", RegexOptions.Singleline | RegexOptions.IgnoreCase);
html = regex1.Replace(html, "");
html = regex2.Replace(html, "");
html = regex3.Replace(html, "");
html = regex4.Replace(html, "");
html = regex5.Replace(html, "");
html = regex6.Replace(html, "");
html = regex7.Replace(html, "");
html = regex8.Replace(html, "");
html = html.Replace("", "");
return html;
}
}
}

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