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
is_possible_card_number(const std::string & input)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
main(int argc,char * argv[])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
70