#include <iostream>
#include <regex>
#include <string_view>

// adapted from: http://stackoverflow.com/a/28142357/831725

auto split(std::string_view input, std::string_view separator = "\\s+") 
{
    std::vector<std::string_view> result;
    std::regex rex(separator.begin(), separator.end());
    std::cregex_token_iterator iter(input.begin(), input.end(), rex, -1);
    std::cregex_token_iterator end;
                             // -1 : get stuff not matched by regex
    for (; iter != end; ++iter)  
    {
        std::string_view::size_type numchars = iter->second - iter->first; 
        result.push_back({iter->first, numchars});
    }
    return result;
}

int main()
{
    for (auto e : split("eins   zwei drei    "))  // Whitespaces als Trenner
    {
        std::cout << e << '\n';
    }

    for (auto e : split("vier|fuenf:sechs,sieben", "[|:,]")) 
    {  
        std::cout << e << '\n';
    }
}