自己留着：正则表达式

原文地址：http://m.cnblogs.com/39034/1593905.html?full=1

RFC1378 http://www.ietf.org/rfc/rfc1738.txt

            #region Http

            stringlowalpha = @"[a-z]";

            stringhialpha = @"[A-Z]";

            //stringalpha = String.Format(@"({0}|{1})", lowalpha, hialpha);

            stringalpha = String.Format(@"[a-zA-Z]", lowalpha, hialpha);

            stringdigit = @"[0-9]";

            stringsafe = @"(\$|-|_|\.|\+)";

            stringextra = @"(!|\*|'|\(|\)|,)";

            //stringhex = String.Format(@"({0}|A|B|C|D|E|F|a|b|c|d|e|f)", digit);

            stringhex = @"[0-9A-Fa-f]";

            //stringescape = String.Format(@"(%{0}{0})", hex);

            stringescape = @"(%[a-zA-Z0-9][a-zA-Z0-9])";

            stringunreserved = String.Format(@"({0}|{1}|{2}|{3})", alpha, digit,safe, extra);

            stringuchar = String.Format(@"({0}|{1})", unreserved, escape);

            stringreserved = @"(;|/|\?|:|@|&|=)";

            stringxchar = String.Format(@"({0}|{1}|{2})", unreserved, reserved,escape);

            stringdigits = String.Format(@"({0}+)", digit);

            //stringalphadigit = String.Format(@"({0}|{1})", alpha, digit);

            stringalphadigit = @"[a-zA-Z0-9]";

            stringdomainlabel = String.Format(@"({0}|{0}({0}|-)*{0})", alphadigit);

            stringtoplabel = String.Format(@"({0}|{0}({1}|-)*{1})", alpha,alphadigit);

            stringhostname = String.Format(@"(({0}\.)*{1})", domainlabel,toplabel);

            stringhostnumber = String.Format(@"{0}\.{0}\.{0}\.{0}", digits);

            stringhost = String.Format(@"({0}|{1})", hostname, hostnumber);

            stringport = digits;

            stringhostport = String.Format(@"({0}(:{1}){{0,1}})", host, port);

            stringhsegment = String.Format(@"(({0}|;|:|@|&|=)*)", uchar);

            stringsearch = String.Format(@"(({0}|;|:|@|&|=)*)", uchar);

            stringhpath = String.Format(@"{0}(/{0})*", hsegment);

            stringhttpurl = String.Format(@"http://{0}(/{1}(\?{2}){{0,1}}){{0,1}}",hostport, hpath, search);

            #endregion

            #region Ftp

            stringuser = String.Format(@"(({0}|;|\?|&|=)*)", uchar);

            stringpassword = String.Format(@"(({0}|;|\?|&|=)*)", uchar);

            stringlogin = String.Format(@"(({0}(:{1}){{0,1}}@){{0,1}}{2})",user, password, hostport);

            stringfsegment = String.Format(@"(({0}|\?|:|@|&|=)*)", uchar);

            stringftptype = @"(A|I|D|a|i|d)";

            stringfpath = String.Format(@"({0}(/{0})*)", fsegment);

            stringftpurl = String.Format(@"ftp://{0}(/{1}(;type={2}){{0,1}}){{0,1}}",login, fpath, ftptype);

            #endregion

            #region News

            stringgroup = String.Format(@"({0}({0}|{1}|-|\.|\+|_)*)", alpha,digit);

            stringarticle = String.Format(@"(({0}|;|/|\?|:|&|=)+@{1})", uchar,host);

            stringgrouppart = String.Format(@"(\*|{0}|{1})", group, article);

            stringnewsurl = String.Format(@"(news:{0})", grouppart);

            #endregion

            #region Nntpurl

            stringnntpurl = String.Format(@"nntp://{0}/{1}(/{2}){{0,1}}",hostport, group, digits);

            #endregion

            #region Telnet

            stringtelneturl = String.Format(@"telnet://{0}/{{0,1}}", login);

            #endregion

            #region Gopher

            stringgtype = xchar;

            stringselector = String.Format(@"({0}*)", xchar);

            stringgopherplus_string = String.Format(@"({0}*)", xchar);

            stringgopherurl = String.Format(@"gopher://{0}(/({1}({2}(%09{3}(%09{4}){{0,1}}){{0,1}}){{0,1}}){{0,1}}){{0,1}}",hostport, gtype, selector, search, gopherplus_string);

            #endregion

            #region Wais

            stringdatabase = String.Format(@"({0}*)", uchar);

            stringwtype = String.Format(@"({0}*)", uchar);

            stringwpath = String.Format(@"({0}*)", uchar);

            stringwaisdatabase = String.Format(@"(wais://{0}/{1})", hostport,database);

            stringwaisindex = String.Format(@"(wais://{0}/{1}\?{2})", hostport,database, search);

            stringwaisdoc = String.Format(@"(wais://{0}/{1}/{2}/{3})", hostport,database, wtype, wpath);

            stringwaisurl = String.Format(@"{0}|{1}|{2}", waisdatabase, waisindex,waisdoc);

            #endregion

            #region Mailto

            stringencoded822addr = String.Format(@"({0}+)", xchar);

            stringmailtourl = String.Format(@"mailto:{0}", encoded822addr);

            #endregion

            #region File

            stringfileurl = String.Format(@"file://({0}{{0,1}}|localhost)/{1}",host, fpath);

            #endregion

            #regionProsperourl

            stringfieldname = String.Format(@"({0}|\?|:|@|&)", uchar);

            stringfieldvalue = String.Format(@"({0}|\?|:|@|&)", uchar);

            stringfieldspec = String.Format(@"(;{0}={1})", fieldname, fieldvalue);

            stringpsegment = String.Format(@"(({0}|\?|:|@|&|=)*)", uchar);

            stringppath = String.Format(@"({0}(/{0})*)", psegment);

            stringprosperourl = String.Format(@"prospero://{0}/{1}({2})*", hostport,ppath, fieldspec);

            #endregion

            #region Otherurl

            //otherurlequal genericurl

            stringurlpath = String.Format(@"(({0})*)", xchar);

            stringscheme = String.Format(@"(({0}|{1}|\+|-|\.)+)", lowalpha,digit);

            stringip_schemepar = String.Format(@"(//{0}(/{1}){{0,1}})", login,urlpath);

            stringschemepart = String.Format(@"(({0})*|{1})", xchar, ip_schemepar);

            stringgenericurl = String.Format(@"{0}:{1}", scheme, schemepart);

            stringotherurl = genericurl;

           #endregion