70 lines
1.7 KiB
C++
70 lines
1.7 KiB
C++
/*
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*
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* Copyright (c) 1998-2002
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* John Maddock
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*
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* Use, modification and distribution are subject to the
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* Boost Software License, Version 1.0. (See accompanying file
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* LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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*
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*/
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/*
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* LOCATION: see http://www.boost.org for most recent version.
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* FILE partial_regex_match.cpp
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* VERSION see <boost/version.hpp>
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* DESCRIPTION: regex_match example using partial matches.
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*/
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#include <boost/regex.hpp>
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#include <string>
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#include <iostream>
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boost::regex e("(\\d{3,4})[- ]?(\\d{4})[- ]?(\\d{4})[- ]?(\\d{4})");
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bool is_possible_card_number(const std::string& input)
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{
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//
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// return false for partial match, true for full match, or throw for
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// impossible match based on what we have so far...
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boost::match_results<std::string::const_iterator> what;
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if(0 == boost::regex_match(input, what, e, boost::match_default | boost::match_partial))
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{
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// the input so far could not possibly be valid so reject it:
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throw std::runtime_error("Invalid data entered - this could not possibly be a valid card number");
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}
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// OK so far so good, but have we finished?
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if(what[0].matched)
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{
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// excellent, we have a result:
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return true;
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}
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// what we have so far is only a partial match...
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return false;
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}
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int main(int argc, char* argv[])
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{
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try{
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std::string input;
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if(argc > 1)
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input = argv[1];
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else
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std::cin >> input;
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if(is_possible_card_number(input))
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{
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std::cout << "Matched OK..." << std::endl;
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}
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else
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std::cout << "Got a partial match..." << std::endl;
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}
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catch(const std::exception& e)
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{
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std::cout << e.what() << std::endl;
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}
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return 0;
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}
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