Parse value range from std::string (For example, parse 10 or 10-19 only)

ParseValueRangeFromString.cpp

inline std::tuple<size_t, size_t> ParseValueRangeFromString(std::string str,
                                                            bool& isValid)
{
    std::regex reValueRange("([[:digit:]]+)(-[[:digit:]]+)?");
    std::smatch values;

    size_t minValue = 0, maxValue = std::numeric_limits<size_t>::max();
    if (!str.empty())
    {
        if (std::regex_match(str, values, reValueRange))
        {
            minValue = static_cast<size_t>(std::atoi(values[1].str().c_str()));
            if (values[2].matched)
            {
                std::string truncatedStr = values[2].str().substr(1);
                maxValue = static_cast<size_t>(std::atoi(truncatedStr.c_str()));
            }
            else
            {
                maxValue = minValue;
            }
          
            if (minValue > maxValue)
            {
                std::swap(minValue, maxValue);
            }
        }
        else
        {
            isValid = false;
        }
    }

    return std::make_tuple(minValue, maxValue);
}