match multiple regex groups in C++

match_multi_group.cpp

#include <regex>

int main(int argc, char const *argv[])
{
	const std::string foo = "hello \n sir \n";
	std::vector<EventPos> pairs;
	generateEvents(foo, '\n', pairs);
	std::printf("%zu\n", pairs.size());
	const std::string sample = "remote= bar foo=4 six=bar fhhfghfgdhgdf do=555";
	const std::regex sampleRex("([a-zA-Z0-9_]+)\\s*=\\s*([a-zA-Z0-9_]+)");
	auto wordsBegin = std::sregex_iterator(sample.begin(), sample.end(), sampleRex);
	auto wordsEnd = std::sregex_iterator();
	for (std::sregex_iterator i = wordsBegin; i != wordsEnd; ++i) {
		std::printf("match pos %zu size %zu\n", i->position(), i->size());
		for (const auto& m : *i) {
			std::printf("%s\n", m.str().c_str());
		}
	}
	return 0;
}