URL 正则表达式，全【转】

由于工作需要写了一个包括所有Url的正则表达式，用来验证返回的Url是否符合RFC1738规定。

有兴趣的同学可以去看RFC1378关于Url部分的介绍（http://www.ietf.org/rfc/rfc1738.txt），本文中的代码是按其规定编写的。

在没有了解RFC1738的时候，一直以为Url的正则表达式很简单，没想到Url有这么多分类，更没想到一个普通的http的正则表达式也不是那么简单。

以下是我搜到的关于http的正则表达式：

http://([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?

当然这已经满足大部分人的需求了，但是如果需要严格的验证的话还是要符合RFC1738了。

Url包括Http，Ftp,News,Nntpurl,Telnet,Gopher,Wais,Mailto,File,Prosperurl和Otherurl。

呵呵，废话不多说了，上代码

#region Http

 

            string lowalpha = @"[a-z]";

            string hialpha = @"[A-Z]";

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

            string digit = @"[0-9]";

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

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

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

            string escape = String.Format(@"(%{0}{0})", hex);

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

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

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

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

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

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

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

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

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

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

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

            string port = digits;

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

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

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

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

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

            #endregion

#region Ftp

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

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

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

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

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

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

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

            #endregion

 

#region News

 

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

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

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

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

 

            #endregion

#region Nntpurl

 

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

 

            #endregion

#region Telnet

 

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

 

            #endregion

#region Gopher

 

            string gtype = xchar;

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

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

            string gopherurl = 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

复制代码

#region Wais

 

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

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

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

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

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

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

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

 

            #endregion

#region Mailto

 

            string encoded822addr = String.Format(@"({0}+)", xchar);

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

 

            #endregion

#region File

 

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

 

            #endregion

#region Prosperourl

 

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

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

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

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

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

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

 

            #endregion

#region Otherurl

 

            //otherurl equal genericurl

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

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

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

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

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

            string otherurl = genericurl;

 

            #endregion

有了Pattern剩下的就简单多了，无非就是正则表达式的验证了，以Http为例：

Http的pattern为string httpurl,假设要验证的Url为url，所以验证url的代码如下：

Regex regex = new Regex(httpurl);

bool isMatchHttp = regex.IsMatch(url);

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