#include <iostream>
#include <string>

#include <boost/regex.hpp>
#include <boost/format.hpp>

// g++ -o regex-bug{,.cpp} -lboost_regex -Wall -pedantic
//  
//  tests case :
//  echo " toto" | regex '[a-z]*' > result_0
//  echo " toto" | regex ' [a-z]*' > result_1
//
//
//

char const * c_decorate_string = "% -12s (%s)" ;
char const * c_decorate_matched = "   [% -3d,% -3d] (%s)" ;

int main(int argc, char * argv[])
{
	using namespace std ;
	using namespace boost ;

	cout << format(c_decorate_string) % "seeked" % argv[1] << endl ;

	regex re(argv[1]) ;
	string extract ;
	getline(cin, extract) ;

	cout << format(c_decorate_string) % "input" % extract << endl ;

	if(extract.length() > 0)
	{
		string const & c_extract = extract ;

		string::const_iterator start = c_extract.begin() ;
		string::const_iterator end = c_extract.end() ;


		smatch matches ;
		match_flag_type flags = match_default ;
		unsigned counter = 0 ;
		while(regex_search(start, end, matches, re, flags))
		{
			cout << format(c_decorate_string) % "current" % std::string(start, end) << endl ;

			for(unsigned i = 0 ; i < matches.size() ; i++)
				cout << format(c_decorate_matched)
					% counter % i
					% std::string(matches[i].first, matches[i].second) << endl ;

			cout << format(c_decorate_string)
				% "suffix"
				% std::string(matches.suffix().first, matches.suffix().second) << endl ;

			cout << format(c_decorate_string)
				% "prefix"
				% std::string(matches.prefix().first, matches.prefix().second) << endl ;

			counter++ ;
			flags |= match_prev_avail ;
			flags |= match_not_bob ;

			if(matches[0].first == matches[0].second)
				throw "If the string is null, it means regex_search has to be false !" ;
			else
				start = matches[0].second ;
		}
	}

	return 0 ;
}