ceph/src/boost/libs/regex/example/snippets/partial_regex_match.cpp

   1 /*
   2  *
   3  * Copyright (c) 1998-2002
   4  * John Maddock
   5  *
   6  * Use, modification and distribution are subject to the
   7  * Boost Software License, Version 1.0. (See accompanying file
   8  * LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9  *
  10  */
  11
  12  /*
  13   *   LOCATION:    see http://www.boost.org for most recent version.
  14   *   FILE         partial_regex_match.cpp
  15   *   VERSION      see <boost/version.hpp>
  16   *   DESCRIPTION: regex_match example using partial matches.
  17   */
  18
  19 #include <boost/regex.hpp>
  20 #include <string>
  21 #include <iostream>
  22
  23 boost::regex e("(\\d{3,4})[- ]?(\\d{4})[- ]?(\\d{4})[- ]?(\\d{4})");
  24
  25 bool is_possible_card_number(const std::string& input)
  26 {
  27    //
  28    // return false for partial match, true for full match, or throw for
  29    // impossible match based on what we have so far...
  30    boost::match_results<std::string::const_iterator> what;
  31    if(0 == boost::regex_match(input, what, e, boost::match_default | boost::match_partial))
  32    {
  33       // the input so far could not possibly be valid so reject it:
  34       throw std::runtime_error("Invalid data entered - this could not possibly be a valid card number");
  35    }
  36    // OK so far so good, but have we finished?
  37    if(what[0].matched)
  38    {
  39       // excellent, we have a result:
  40       return true;
  41    }
  42    // what we have so far is only a partial match...
  43    return false;
  44 }
  45
  46 int main(int argc, char* argv[])
  47 {
  48    try{
  49       std::string input;
  50       if(argc > 1)
  51          input = argv[1];
  52       else
  53          std::cin >> input;
  54       if(is_possible_card_number(input))
  55       {
  56          std::cout << "Matched OK..." << std::endl;
  57       }
  58       else
  59          std::cout << "Got a partial match..." << std::endl;
  60    }
  61    catch(const std::exception& e)
  62    {
  63       std::cout << e.what() << std::endl;
  64    }
  65    return 0;
  66 }
  67
  68
  69