万能Url正则表达式[http,ftp,news,telnet.....]——史上最全Url正则表达式（基于RFC1738‏

储9369

　　文章来源：http://www.pin5i.com/showtopic-25932.html
　　
　　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- ./?%&=]*)?
  

复制代码
　　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
  

复制代码

• #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
  

复制代码

• #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
  

复制代码

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

复制代码

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

复制代码

• #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
  

复制代码

• #region Mailto
  
•             string encoded822addr = String.Format(@"({0}+)", xchar);
  
•             string mailtourl = String.Format(@"mailto:{0}", encoded822addr);
  
•             #endregion
  

复制代码

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

复制代码

• #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
  

复制代码

• #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
  

复制代码
　　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);
  

复制代码