match_ip.cpp

#include <stdlib.h>
#include <boost/regex.hpp>
#include <iostream>
int main()
{
	boost::regex e("(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])");
	boost::match_results<std::string::const_iterator> what;
	const std::string str("哈哈哈 8.8.8.8 1.2.3.4 256.256.247.1");
	auto first = str.begin();
	auto last = str.end();
	std::cout << "string is " << str << std::endl;
	while(boost::regex_search(first, last, what, e))
	{
		std::cout << std::string(what[0].first, what[0].second) << std::endl;
		first = what[0].second;
	}
}