实现网址的自动识别

  public  static string Auto(string str)
  //========================//
  //     www.
  //     http://
  //     ftp://
  //     [email protected]
  //     mms://
  //========================//
  {
   Reg = new Regex("([^\\]=>])(http://[A-Za-z0-9\\./=\\?%\\-&_~`@':+!]+)");
   str = Reg.Replace(str,"$1<a href=\"$2\" target=\"_blank\">$2</a>");
   Reg = new Regex("^(http://[A-Za-z0-9\\./=\\?%\\-&_~`@':+!]+)");
   str = Reg.Replace(str,"<a href=\"$1\" target=\"_blank\">$1</a>");
   Reg = new Regex("(http://[A-Za-z0-9\\./=\\?%\\-&_~`@':+!]+)$");
   str = Reg.Replace(str,"<a href=\"$1\" target=\"_blank\">$1</a>");
   Reg = new Regex("([^\\]=>])(ftp://[A-Za-z0-9\\./=\\?%\\-&_~`@':+!]+)");
   str = Reg.Replace(str,"$1<a href=\"$2\" target=\"_blank\">$2</a>");
   Reg = new Regex("^(ftp://[A-Za-z0-9\\./=\\?%\\-&_~`@':+!]+)");
   str = Reg.Replace(str,"<a href=\"$1\" target=\"_blank\">$1</a>");
   Reg = new Regex("(ftp://[A-Za-z0-9\\./=\\?%\\-&_~`@':+!]+)$");
   str = Reg.Replace(str,"<a href=\"$1\" target=\"_blank\">$1</a>");
   Reg = new Regex("([^\\]=>])(mms://[A-Za-z0-9\\./=\\?%\\-&_~`@':+!]+)");
   str = Reg.Replace(str,"$1<a href=\"$2\" target=\"_blank\">$2</a>");
   Reg = new Regex("^(mms://[A-Za-z0-9\\./=\\?%\\-&_~`@':+!]+)");
   str = Reg.Replace(str,"<a href=\"$1\" target=\"_blank\">$1</a>"); 
   Reg = new Regex("(mms://[A-Za-z0-9\\./=\\?%\\-&_~`@':+!]+)$");
   str = Reg.Replace(str,"<a href=\"$1\" target=\"_blank\">$1</a>");
   Reg = new Regex("([a-z0-9_A-Z\\-\\.]{1,20})@([a-z0-9_\\-]{1,15})\\.([a-z]{2,4})");
   str = Reg.Replace(str,"<a href=\"mailto:$1@$2.$3\" target=\"_blank\">$1@$2.$3</a>");
   Reg = new Regex("([^/])(www.[A-Za-z0-9\\./=\\?%\\-&_~`@':+!]+)");
   str = Reg.Replace(str,"$1<a href=\"http://$2\" target=\"_blank\">$2</a>");
   Reg = new Regex("^(www.[A-Za-z0-9\\./=\\?%\\-&_~`@':+!]+)");
   str = Reg.Replace(str,"<a href=\"http://$1\" target=\"_blank\">$1</a>");
   Reg = new Regex("(www.[A-Za-z0-9\\./=\\?%\\-&_~`@':+!]+)$");
   str = Reg.Replace(str,"<a href=\"http://$1\" target=\"_blank\">$1</a>");
   return str;
  }

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