获得截取后的字符串

http://www.cnblogs.com/xiaobaigang/archive/2007/09/24/904513.html
private   string  GetString( string  data,  string  FindStr,  string  EndStr)
     {
        Match m = Regex.Match(data, "(?:" + ReplaceChar(FindStr) + @")([\w\W]*?)" + ReplaceChar(EndStr));
        return m.Groups[1].ToString();
    }

使用方法如:
  string str="abcdefghijglmn";
  GetString(str,"bc","hi"); 将得到 "defg"  也就是得到FindStr和EndStr之间的字符串 

string s1="cdeeacdf";//按顺序转化成　accddeef
char[] arr=s1.ToCharArray();
 Array.Sort(arr);
string t = "";
for(int i= 0;i<arr.Length ;i++)
{ t += arr[i]; }
Response.Write(s1 + "<br>t:" + t);
Response.End();

string aa="abcdef";//输出字母用逗号分开
   char [] ab=aa.ToCharArray();
   aa = "";
   int num = 0;
   foreach(char a in ab)
   {
    aa += ((num==0)?(""):(",")) + a.ToString();
    ++num;
   }
   Response.Write(aa);
   Response.End();