CPP +正则表达式以验证URL

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问题描述

正则表达式必须满足以下条件。

有效网址： -

http://www.google.com

网址无效： -

\MyWebSite / \ISAPIWEBSITE / \Denypage.aspx / = Regx必须检查& /\\\\\\\ MyWebSite/\ISAPIWEBSITE/\Denypage.aspx /

=正则表达式必须检查&无效的网址，用于额外插入％5C& ％2F字符。

如何开发一个满足上述条件的通用正则表达式。
请帮助我们，通过提供一个正则表达式来处理CPP {MFC}中的上述场景。

解决方案

尝试使用建议？如果您能够使用GCC-4.9，那么您可以直接使用< regex> 。

使用 ^（（[^：/？＃] +）：）？（//（[^ /？＃] *）（[^＃] *））？（＃（。*））？您可以作为子匹配：

  scheme = $ 2 
 authority = $ 4 
 path = $ 5 
 query = $ 7 
 fragment = $ 9

例如：

  int main（int argc，char * argv []）
 {
 std :: string url（argv [1]）; 
 unsigned counter = 0; 
 
 std :: regex url_regex（
 R（^（（^：\ /？＃] +）：）？（//（[^ \ /？＃ *））？（[^？＃] *）（\？（[^＃] *））？（＃（。*））？），
 std :: regex :: extended 
）; 
 std :: smatch url_match_result; 
 
 std :: cout<< 检查：< url<< std :: endl; 
 
 if（std :: regex_match（url，url_match_result，url_regex））{
 for（const auto& res：url_match_result）{
 std :: cout< counter ++<< ：<< res<< std :: endl; 
} 
} else {
 std :: cerr<< 格式错误的网址。 << std :: endl; 
} 
 
 return EXIT_SUCCESS; 
}

然后：

  ./ url-matcher http://localhost.com/path\?hue\=br\#cool 
 
检查：http：// localhost.com/path?hue=br#cool 
 0：http://localhost.com/path?hue=br#cool 
 1：http：
 2：http 
 3：//localhost.com 
 4：localhost.com 
 5：/ path 
 6：？hue = br 
 7：hue = br 
 8： #cool 
 9：cool

I want to build a regular expression in c++{MFC} which validates the URL.

The regular expression must satisfy following conditions.

Valid URL:-http://cu-241.dell-tech.co.in/MyWebSite/ISAPIWEBSITE/Denypage.aspx/http://www.google.comhttp://www.google.co.in

Invalid URL:-

http://cu-241.dell-tech.co.in/\MyWebSite/\ISAPIWEBSITE/\Denypage.aspx/ = Regx must check & invalid URL as '\' character between "/\MyWebSite/\ISAPIWEBSITE/\Denypage.aspx/"
http://cu-241.dell-tech.co.in//////MyWebSite/ISAPIWEBSITE/Denypage.aspx/ = Regx must check & invalidate URL due to multiple entries of "///////" in url.
http://news.google.co.in/%5Cnwshp?hl=en&tab=wn = Regex must check & invalidate URL for additional insertion of %5C & %2F character.

How can we develop a generic Regular Expression satisfying above condition.Please, Help us by providing a regular expression that will handle above scenario's in CPP{MFC}

解决方案

Have you tried using the RFC 3986 suggestion? If you're capable of using GCC-4.9 then you can go directly with <regex>.

It states that with ^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))? you can get as submatches:

  scheme    = $2
  authority = $4
  path      = $5
  query     = $7
  fragment  = $9

For example:

int main(int argc, char *argv[])
{
  std::string url (argv[1]);
  unsigned counter = 0;

  std::regex url_regex (
    R"(^(([^:\/?#]+):)?(//([^\/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?)",
    std::regex::extended
  );
  std::smatch url_match_result;

  std::cout << "Checking: " << url << std::endl;

  if (std::regex_match(url, url_match_result, url_regex)) {
    for (const auto& res : url_match_result) {
      std::cout << counter++ << ": " << res << std::endl;
    }
  } else {
    std::cerr << "Malformed url." << std::endl;
  }

  return EXIT_SUCCESS;
}

Then:

./url-matcher http://localhost.com/path\?hue\=br\#cool

Checking: http://localhost.com/path?hue=br#cool
0: http://localhost.com/path?hue=br#cool
1: http:
2: http
3: //localhost.com
4: localhost.com
5: /path
6: ?hue=br
7: hue=br
8: #cool
9: cool

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