电脑整理的时候发现的一些

正则超级链接

                string pattenhref = "<a([^>])*>";
                string pattenhrefend = "</a([^>])*>";
                Regex rg = new Regex(pattenhref, RegexOptions.Multiline | RegexOptions.Singleline);
                MatchCollection m = rg.Matches(strtext);
                for (int i = 0; i < m.Count; i++)
                {
                    MessageBox.Show(m[i].Result);
                }



取反

                string pattenhref = "<a([^>])*>";
                string pattenhrefend = "</a([^>])*>";
                Regex rg = new Regex(pattenhref, RegexOptions.Multiline | RegexOptions.Singleline);
                MatchCollection m = rg.Matches(strtext);
                for (int i = 0; i < m.Count; i++)
                {
                    MessageBox.Show(m[i].Result);
                }



引用楼主 firendlys 的回复:
现在，我想要做的是，想做一个匹配，匹配除了 true false 这2个单词之外的任何字符。




VB.NET code
//如果是单个字符 (?is)(?!true|false). //如果是多个字符(?is)((?!true|false).)+

 string pattenhref = "<a([^>])*>";
                string pattenhrefend = "</a([^>])*>";
                Regex rg = new Regex(pattenhref, RegexOptions.Multiline | RegexOptions.Singleline);
                strtext = rg.Replace(strtext, "");
                MessageBox.Show(strtext);

做采集用到的正则

string regexstr = @"<(?!br|p|/p).*?>";   //去除所有标签，只剩img,br,p
html = Regex.Replace(html, regexstr, string.Empty, RegexOptions.IgnoreCase);

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Text.RegularExpressions;
using System.Collections;
using System.IO;

namespace kuaifa.Common
{
    public static class HttpCJ
    {
        public static string GetHTML(string url, string encoding)
        {
            WebClient web = new WebClient();
            byte[] buffer = web.DownloadData(url);
            return Encoding.GetEncoding(encoding).GetString(buffer);
        }
        public static string GetSubValue(string str, string s, string e)
        {
            Regex rg = new Regex("(?<=(" + s + "))[.\s\S]*?(?=(" + e + "))", RegexOptions.Multiline | RegexOptions.Singleline);
            return rg.Match(str).Value;
        }
        public static ArrayList GetMatchesStr(string htmlCode, string strRegex)
        {
            ArrayList al = new ArrayList();

            Regex r = new Regex(strRegex, RegexOptions.IgnoreCase | RegexOptions.Multiline);
            MatchCollection m = r.Matches(htmlCode);

            for (int i = 0; i < m.Count; i++)
            {
                bool rep = false;
                string strNew = m[i].ToString();

                // 过滤重复的URL 
                foreach (string str in al)
                {
                    if (strNew == str)
                    {
                        rep = true;
                        break;
                    }
                }

                if (!rep) al.Add(strNew);
            }

            al.Sort();

            return al;
        }




        public static string GetDataFromUrl(string url)
        {

            string str = string.Empty;

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

            //设置Http头；

            request.AllowAutoRedirect = true;

            request.AllowWriteStreamBuffering = true;

            request.Referer = "";

            request.Timeout = 10 * 1000;

            //request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022)";

            HttpWebResponse response = null;

            try
            {

                response = (HttpWebResponse)request.GetResponse();

                if (response.StatusCode == HttpStatusCode.OK)
                {

                    //根据http应答头来判别编码

                    string Characterset = response.CharacterSet;

                    Encoding encode;

                    if (Characterset != "")
                    {

                        if (Characterset == "ISO-8859-1")
                        {

                            Characterset = "gb2312";

                        }

                        encode = Encoding.GetEncoding(Characterset);

                    }

                    else
                    {

                        encode = Encoding.Default;

                    }

                    //声明一个内存流来贮存http应答流

                    Stream Receivestream = response.GetResponseStream();

                    MemoryStream mstream = new MemoryStream();

                    byte[] bf = new byte[255];

                    int count = Receivestream.Read(bf, 0, 255);

                    while (count > 0)
                    {

                        mstream.Write(bf, 0, count);

                        count = Receivestream.Read(bf, 0, 255);

                    }

                    Receivestream.Close();

                    mstream.Seek(0, SeekOrigin.Begin);

                    //从内存流里读取字符串这里涉及到了编码方案

                    StreamReader reader = new StreamReader(mstream, encode);

                    char[] buf = new char[1024];

                    count = reader.Read(buf, 0, 1024);

                    while (count > 0)
                    {

                        str += new string(buf, 0, 1024);

                        count = reader.Read(buf, 0, 1024);



                    }

                    reader.Close();

                    mstream.Close();







                }



            }

            catch (Exception ex)
            {



                GetDataFromUrl(url);



            }

            finally
            {

                if (response != null)

                    response.Close();

            }



            return str;

        }

    }
}

byte与string与char.txt

byte[]   ByteArray={120,121,123,128,129,130}; 
char[]   CharArray=System.Text.Encoding.ASCII.GetChars(ByteArray); 

for(int   i=0;i <CharArray.Length;i++) 
{ 
//其实此处128后面的编码无法显示 
Console.WriteLine( "{0}:{1} ",i,CharArray[i]); 
} 

Console.WriteLine(); 

//此处得到我们订制的ASCII字符串，然后模拟您的测试 

string   s=new   String(CharArray); 
Console.WriteLine(s); 

byte[]   newByteArray=System.Text.Encoding.ASCII.GetBytes(s); 


读:TextBox1.Text=File.ReadAllText("d:/b.txt",Encoding.Default);

写:File.WriteAllText("d:/a.txt", TextBox1.Text, Encoding.Default);

 

追加:File.AppendAllText("d:/a.txt", TextBox1.Text, Encoding.Default); 


string s = System.Text.Encoding.Default.GetString(ib);
byte[] b = System.Text.Encoding.Default.GetBytes(s);

  MemoryStream buf = new MemoryStream(b);
  Image image = Image.FromStream(buf, true);
  pictureBox_File.Image = image;


项目中我用的汉字，String args = new String(data,"GB2312"); 好用！
 




     Encoding encoding = Encoding.GetEncoding(Encode);
                byte[] bytes = encoding.GetBytes(PostStr);

                //string retstr = System.Text.Encoding.UTF8.GetString(bytes);
                //MessageBox.Show(retstr);


public string recvMessage()
{
  byte[] recvBytes = new byte[Int32.Parse(ss)];
  int bytes=0;
  bytes += s.Receive(recvBytes, recvBytes.Length, 0);
  byte[] gb = Encoding.Convert(utf8, gb2312, recvBytes);
  string sGb = gb2312.GetString(gb);
}