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

1<a href='\"$2\"' target='\"_blank\"'>$2</a>

");
Reg = new Regex("^(http://[A-Za-z0-9\\./=\?%\\-&_~`@':+!]+)");
str = Reg.Replace(str,"

1<a href='\"$1\"' target='\"_blank\"'>$1</a>

");
Reg = new Regex("(http://[A-Za-z0-9\\./=\?%\\-&_~`@':+!]+)$");
str = Reg.Replace(str,"

1<a href='\"$1\"' target='\"_blank\"'>$1</a>

");
Reg = new Regex("([^\\]=>])(ftp://[A-Za-z0-9\\./=\?%\\-&_~`@':+!]+)");
str = Reg.Replace(str,"$1

1<a href='\"$2\"' target='\"_blank\"'>$2</a>

");
Reg = new Regex("^(ftp://[A-Za-z0-9\\./=\?%\\-&_~`@':+!]+)");
str = Reg.Replace(str,"

1<a href='\"$1\"' target='\"_blank\"'>$1</a>

");
Reg = new Regex("(ftp://[A-Za-z0-9\\./=\?%\\-&_~`@':+!]+)$");
str = Reg.Replace(str,"

1<a href='\"$1\"' target='\"_blank\"'>$1</a>

");
Reg = new Regex("([^\\]=>])(mms://[A-Za-z0-9\\./=\?%\\-&_~`@':+!]+)");
str = Reg.Replace(str,"$1

1<a href='\"$2\"' target='\"_blank\"'>$2</a>

");
Reg = new Regex("^(mms://[A-Za-z0-9\\./=\?%\\-&_~`@':+!]+)");
str = Reg.Replace(str,"

1<a href='\"$1\"' target='\"_blank\"'>$1</a>

");
Reg = new Regex("(mms://[A-Za-z0-9\\./=\?%\\-&_~`@':+!]+)$");
str = Reg.Replace(str,"

1<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,"

1<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

1<a href='\"http://$2\"' target='\"_blank\"'>$2</a>

");
Reg = new Regex("^(www.[A-Za-z0-9\\./=\?%\\-&_~`@':+!]+)");
str = Reg.Replace(str,"

1<a href='\"http://$1\"' target='\"_blank\"'>$1</a>

");
Reg = new Regex("(www.[A-Za-z0-9\\./=\?%\\-&_~`@':+!]+)$");
str = Reg.Replace(str,"

1<a href='\"http://$1\"' target='\"_blank\"'>$1</a>

");
return str;
}