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#include <iostream>
#include <vector>
#include <boost/regex.hpp>
int
main (int argc, char *argv[])
{
if (argc<2)
{
std::cerr << "Usage: " << argv[0] << " <dd/mm/yy>" << std::endl;
return 1;
}
std::string req_date = argv[1];
std::vector<boost::regex> month_regexp;
month_regexp.push_back(boost::regex("\\A(jan)|[^\\d\\w](jan)|[^\\d\\w]1[^\\d\\w]|[^\\d\\w]01[^\\d\\w]",boost::regex_constants::icase));
month_regexp.push_back(boost::regex("\\A(feb)|[^\\d\\w](feb)|[^\\d\\w]2[^\\d\\w]|[^\\d\\w]02[^\\d\\w]",boost::regex_constants::icase));
month_regexp.push_back(boost::regex("\\A(mar)|[^\\d\\w](mar)|[^\\d\\w]3[^\\d\\w]|[^\\d\\w]03[^\\d\\w]",boost::regex_constants::icase));
month_regexp.push_back(boost::regex("\\A(ap)|[^\\d\\w](ap)|[^\\d\\w]4[^\\d\\w]|[^\\d\\w]04[^\\d\\w]",boost::regex_constants::icase));
month_regexp.push_back(boost::regex("\\A(may)|[^\\d\\w](may)|[^\\d\\w]5[^\\d\\w]|[^\\d\\w]05[^\\d\\w]",boost::regex_constants::icase));
month_regexp.push_back(boost::regex("\\A(jun)|[^\\d\\w](jun)|[^\\d\\w]6[^\\d\\w]|[^\\d\\w]06[^\\d\\w]",boost::regex_constants::icase));
month_regexp.push_back(boost::regex("\\A(jul)|[^\\d\\w](jul)|[^\\d\\w]7[^\\d\\w]|[^\\d\\w]07[^\\d\\w]",boost::regex_constants::icase));
month_regexp.push_back(boost::regex("\\A(au)|[^\\d\\w](au)|[^\\d\\w]8[^\\d\\w]|[^\\d\\w]08[^\\d\\w]",boost::regex_constants::icase));
month_regexp.push_back(boost::regex("\\A(se)|[^\\d\\w](se)|[^\\d\\w]9[^\\d\\w]|[^\\d\\w]09[^\\d\\w]",boost::regex_constants::icase));
month_regexp.push_back(boost::regex("\\A(o)|[^\\d\\w](o)|[^\\d\\w]10[^\\d\\w]",boost::regex_constants::icase));
month_regexp.push_back(boost::regex("\\A(n)|[^\\d\\w](n)|[^\\d\\w]11[^\\d\\w]",boost::regex_constants::icase));
month_regexp.push_back(boost::regex("\\A(d)|[^\\d\\w](d)|[^\\d\\w]12[^\\d\\w]",boost::regex_constants::icase));
unsigned int month_index;
bool valid_day = false;
bool valid_month = false;
bool valid_year = false;
for (unsigned int i = 0; i < month_regexp.size(); ++i)
{
if (boost::regex_search(req_date, month_regexp[i],
boost::regex_constants::format_perl))
{
month_index = i +1;
#ifdef DEBUG
std::cerr << "DEBUG : month_index == " << month_index << std::endl;
#endif
valid_month = true;
}
}
// We're using it for printing the regex matched.
boost::smatch m;
std::string tmp_string;
std::string day_str;
// In prose: if the number related to the day is at the beginning
// of the string, if it's among NON-digits or if it's at the end of the string
// -with NON-digits on the left.
if (boost::regex_search(req_date, m,
boost::regex("\\A(\\d{1,2})\\D|\\D(\\d{1,2})\\D|\\D(\\d{1,2})\\Z", boost::regex_constants::icase),
boost::regex_constants::format_perl))
{
#ifdef DEBUG
std::cerr << "DEBUG : m.str() == " << m.str() << std::endl;
#endif
tmp_string = m.str();
boost::regex_search(tmp_string, m,
boost::regex("\\d{1,2}"),
boost::regex_constants::format_perl);
day_str = m.str();
#ifdef DEBUG
std::cout << "DEBUG : day_str == " << day_str << std::endl;
#endif
valid_day = true;
}
else
{
std::cerr << "Sorry, but I couldn't extract "
<< "a valid day from the starting string. \n";
valid_day = false;
}
std::string year_str;
if (boost::regex_search(req_date, m,
boost::regex("\\A(\\d{4})\\D|\\D(\\d{4})\\D|\\D(\\d{4})\\Z", boost::regex_constants::icase),
boost::regex_constants::format_perl))
{
tmp_string = m.str();
boost::regex_search(tmp_string, m,
boost::regex("\\d{4}", boost::regex_constants::icase),
boost::regex_constants::format_perl);
year_str = m.str();
#ifdef DEBUG
std::cout << "DEBUG : year_str == " << year_str << std::endl;
#endif
valid_year = true;
}
else
{
std::cerr << "Sorry, but I couldn't extract "
<< "a valid year from the starting string. \n";
valid_year = false;
}
if(valid_day && valid_month && valid_year)
{
std::cout << "Date typed is : "
<< day_str << " - "
<< month_index << " - "
<< year_str << std::endl;
}
else
{
std::cout << "Cannot understand data typed." << std::endl;
}
return 0;
}
//
//
// EXAMPLE:
// Input => ./ex1.x 21jun1992
// Output => Data typed is : 21 - 6 - 1992
//
//
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