所有Url的正则表达式，用来验证返回的Url是否符合RFC1738规定

from:http://www.pin5i.com/showtopic-25932.html

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：

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

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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

1. #region Http
   
2. 
   
3.             string lowalpha = @"[a-z]";
   
4.             string hialpha = @"[A-Z]";
   
5.             string alpha = String.Format(@"({0}|{1})", lowalpha, hialpha);
   
6.             string digit = @"[0-9]";
   
7.             string safe = @"(\$|-|_|\.|\+)";
   
8.             string extra = @"(!|\*|'|\(|\)|,)";
   
9.             string hex = String.Format(@"({0}|A|B|C|D|E|F|a|b|c|d|e|f)", digit);
   
10.             string escape = String.Format(@"(%{0}{0})", hex);
    
11.             string unreserved = String.Format(@"({0}|{1}|{2}|{3})", alpha, digit, safe, extra);
    
12.             string uchar = String.Format(@"({0}|{1})", unreserved, escape);
    
13.             string reserved = @"(;|/|\?|:|@|&|=)";
    
14.             string xchar = String.Format(@"({0}|{1}|{2})", unreserved, reserved, escape);
    
15.             string digits = String.Format(@"({0}+)", digit);
    
16. 
    
17.             string alphadigit = String.Format(@"({0}|{1})", alpha, digit);
    
18.             string domainlabel = String.Format(@"({0}|{0}({0}|-)*{0})", alphadigit);
    
19.             string toplabel = String.Format(@"({0}|{0}({1}|-)*{1})", alpha, alphadigit);
    
20.             string hostname = String.Format(@"(({0}\.)*{1})", domainlabel, toplabel);
    
21.             string hostnumber = String.Format(@"{0}\.{0}\.{0}\.{0}", digits);
    
22.             string host = String.Format(@"({0}|{1})", hostname, hostnumber);
    
23.             string port = digits;
    
24.             string hostport = String.Format(@"({0}(:{1}){{0,1}})", host, port);
    
25.             string hsegment = String.Format(@"(({0}|;|:|@|&|=)*)", uchar);
    
26.             string search = String.Format(@"(({0}|;|:|@|&|=)*)", uchar);
    
27.             string hpath = String.Format(@"{0}(/{0})*", hsegment);
    
28.             string httpurl = String.Format(@"http://{0}(/{1}(\?{2}){{0,1}}){{0,1}}", hostport, hpath, search);
    
29. 
    
30.             #endregion
    

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1. #region Ftp
   
2. 
   
3.             string user = String.Format(@"(({0}|;|\?|&|=)*)", uchar);
   
4.             string password = String.Format(@"(({0}|;|\?|&|=)*)", uchar);
   
5.             string login = String.Format(@"(({0}(:{1}){{0,1}}@){{0,1}}{2})", user, password, hostport);
   
6.             string fsegment = String.Format(@"(({0}|\?|:|@|&|=)*)", uchar);
   
7.             string ftptype = @"(A|I|D|a|i|d)";
   
8.             string fpath = String.Format(@"({0}(/{0})*)", fsegment);
   
9.             string ftpurl = String.Format(@"ftp://{0}(/{1}(;type={2}){{0,1}}){{0,1}}", login, fpath, ftptype);
   
10. 
    
11.             #endregion
    

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1. #region News
   
2. 
   
3.             string group = String.Format(@"({0}({0}|{1}|-|\.|\+|_)*)", alpha, digit);
   
4.             string article = String.Format(@"(({0}|;|/|\?|:|&|=)+@{1})", uchar, host);
   
5.             string grouppart = String.Format(@"(\*|{0}|{1})", group, article);
   
6.             string newsurl = String.Format(@"(news:{0})", grouppart);
   
7. 
   
8.             #endregion
   

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1. #region Nntpurl
   
2. 
   
3.             string nntpurl = String.Format(@"nntp://{0}/{1}(/{2}){{0,1}}", hostport, group, digits);
   
4. 
   
5.             #endregion
   

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1. #region Telnet
   
2. 
   
3.             string telneturl = String.Format(@"telnet://{0}/{{0,1}}", login);
   
4. 
   
5.             #endregion
   

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1. #region Gopher
   
2. 
   
3.             string gtype = xchar;
   
4.             string selector = String.Format(@"({0}*)", xchar);
   
5.             string gopherplus_string = String.Format(@"({0}*)", xchar);
   
6.             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);
   
7. 
   
8.             #endregion
   

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1. #region Wais
   
2. 
   
3.             string database = String.Format(@"({0}*)", uchar);
   
4.             string wtype = String.Format(@"({0}*)", uchar);
   
5.             string wpath = String.Format(@"({0}*)", uchar);
   
6.             string waisdatabase = String.Format(@"(wais://{0}/{1})", hostport, database);
   
7.             string waisindex = String.Format(@"(wais://{0}/{1}\?{2})", hostport, database, search);
   
8.             string waisdoc = String.Format(@"(wais://{0}/{1}/{2}/{3})", hostport, database, wtype, wpath);
   
9.             string waisurl = String.Format(@"{0}|{1}|{2}", waisdatabase, waisindex, waisdoc);
   
10. 
    
11.             #endregion
    

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1. #region Mailto
   
2. 
   
3.             string encoded822addr = String.Format(@"({0}+)", xchar);
   
4.             string mailtourl = String.Format(@"mailto:{0}", encoded822addr);
   
5. 
   
6.             #endregion
   

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1. #region File
   
2. 
   
3.             string fileurl = String.Format(@"file://({0}{{0,1}}|localhost)/{1}", host, fpath);
   
4. 
   
5.             #endregion
   

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1. #region Prosperourl
   
2. 
   
3.             string fieldname = String.Format(@"({0}|\?|:|@|&)", uchar);
   
4.             string fieldvalue = String.Format(@"({0}|\?|:|@|&)", uchar);
   
5.             string fieldspec = String.Format(@"(;{0}={1})", fieldname, fieldvalue);
   
6.             string psegment = String.Format(@"(({0}|\?|:|@|&|=)*)", uchar);
   
7.             string ppath = String.Format(@"({0}(/{0})*)", psegment);
   
8.             string prosperourl = String.Format(@"prospero://{0}/{1}({2})*", hostport, ppath, fieldspec);
   
9. 
   
10.             #endregion
    

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1. #region Otherurl
   
2. 
   
3.             //otherurl equal genericurl
   
4.             string urlpath = String.Format(@"(({0})*)", xchar);
   
5.             string scheme = String.Format(@"(({0}|{1}|\+|-|\.)+)", lowalpha, digit);
   
6.             string ip_schemepar = String.Format(@"(//{0}(/{1}){{0,1}})", login, urlpath);
   
7.             string schemepart = String.Format(@"(({0})*|{1})", xchar, ip_schemepar);
   
8.             string genericurl = String.Format(@"{0}:{1}", scheme, schemepart);
   
9.             string otherurl = genericurl;
   
10. 
    
11.             #endregion
    

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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：

1. Regex regex = new Regex(httpurl);
   
2. bool isMatchHttp = regex.IsMatch(url);
   

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（文/pangxiaoliang[北京]流浪者）