Parse Key/Value pairs with boost::regex

parsekv.h

#ifndef PARSEKV_H
#define PARSEKV_H

#include <tuple>
#include <string>
#include <boost/regex.hpp>

// link against boost_regex (-lboost_regex)

std::tuple<std::string,std::string> parseKeyValue(std::string arg)
{
    boost::smatch results;

    // Legal chars for key: numbers, letters, minus, underscore, point and slash (at least one)
    // Legal chars for value: any char
    // NOTE: if NO space is allowed between key, searator(=) and value, use the following regex instead
    //boost::regex r{ "([\\w\\-_\\.\\/]+)=(.*)"};
    
    boost::regex r{ "([\\w\\-_\\.\\/]+)\\s*=\\s*(.*)"};
    if (!boost::regex_match(arg, results, r)) {
        return std::tuple<std::string, std::string>();
    }

    if (results.size() != 3) {
        return std::tuple<std::string, std::string>();
    }

    return std::make_tuple<std::string,std::string>(results[1], results[2]);
};

#endif // PARSEKV_H