boost_regex_lookahead.cpp

#include <iostream>
#include <iterator>
#include <vector>
#include <string>
#include <fstream>
#include <set>
#include <map>

#include <boost/regex.hpp>

//std::string regex_str = R"(^Matches found.*?(?= \())";
std::string regex_str = "diabetes.*?\\(octave #(\\d{1,})?\\)";
const boost::regex frequency_line(regex_str, boost::regex_constants::icase);

int main(int argc, char* argv[]) {

//    std::ifstream *file = new std::ifstream("frequencies");
    std::string str = "";

    boost::smatch match;

	//for (std::string str; std::getline(*file, str);) {
		if (boost::regex_search(str, match, frequency_line)) {
			std::cout << str << std::endl;
			std::cout << match[0] << std::endl;
			std::cout << match[1] << std::endl;
			//std::cout << match[2] << std::endl;
			//std::cout << match[3] << std::endl;
		}
	//}

	//delete file;
	return 0;
}