cppregexurlparser1.cpp - regex URL parser
Posted by Anonymous on Wed 24th Jan 2024 09:33
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/*
 * MIT License
 *
 * Copyright (c) 2024 Roland Mainz <roland.mainz@nrubsig.org>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

/*
 * cppregexurlparser1.cpp - regex URL parer
 */
#include <regex>
#include <iostream>
#include <stdlib.h>

int main(int ac, char *av[])
{
  std::string Input {"myurl://foo:80/bar"};
  /*
   * MSVC:
   * be aware of https://stackoverflow.com/questions/39645660/stdregex-to-match-begin-end-of-string
   */
  std::regex Pattern {
                "^"
                "(.+?)"                         // scheme
                "://"                           // '://'
                "("                             // login
                        "(?:"
                                "(.+?)"         // user (optional)
                                "(?::(.+))?"    // password (optional)
                                "@"
                        ")?"
                        "("                     // hostport
                                "(.+?)"         // host
                                "(?::([[:digit:]]+))?" // port (optional)
                        ")"
                ")"
                "(?:/(.*?))?"                   // path (optional)
                "$",
        std::regex_constants::ECMAScript };
  std::smatch Matches;

  if (std::regex_search(Input, Matches,
                        Pattern)) {
    std::cout << Matches.size()
              << " submatches found!";
    for (size_t i{0}; i < Matches.size(); ++i) {
      std::cout << "\n\nSubmatch " << i << ": "
                << Matches[i] << "\n  Length: "
                << Matches[i].length()
                << "\n  First Character: "
                << *Matches[i].first
                << "\n  Position: "
                << Matches.position(i) << std::endl;
    }
  }
  return EXIT_SUCCESS;
}