How to parse a command line with regular expressions?

Question

I want to split a command line like string in single string parameters. How look the regular expression for it. The problem are that the parameters can be quoted. For exampl

Answer 1

("[^"]+"|[^\s"]+)

what i use C++

#include 
#include 
#include 
#include 

void foo()
{
    std::string strArg = " \"par   1\"  par2 par3 \"par 4\""; 

    std::regex word_regex( "(\"[^\"]+\"|[^\\s\"]+)" );
    auto words_begin = 
        std::sregex_iterator(strArg.begin(), strArg.end(), word_regex);
    auto words_end = std::sregex_iterator();
    for (std::sregex_iterator i = words_begin; i != words_end; ++i)
    {
        std::smatch match = *i;
        std::string match_str = match.str();
        std::cout << match_str << '\n';
    }
}

Output:

"par   1"
par2
par3
"par 4"