C ++ [std :: regex]试图只匹配中间带空格的数字

Question

I'm working on a card game in C++ where I want to get some user input via getline(). The input needs to be in this specific format:

"1 2 3 4 5 6"

The range of numbers is 1-11 and each number must be seperated with a space. The user is putting in index numbers for a vector. Say he writes "1 2 3" and hits enter, position 0, 1 and 2 are being adressed by the vector.

I'm also open for any other recommendations considering the design decision to let the user input the vector (or essentially their card's) position.

The player cards are displayed in this format "1 blue" and are stored as strings in a vector. I figured it is too much hassle for the user to input the whole card name, so I chose to use the vector index.

Below is the code snippet of my regex string. It works, kinda. It just pushes the whole string in the vector, missing the 10. But I don't need 1 vector element like this: "1 2 3 4", I need 4 vector elements with every number being one element.

Things that shouldn't match:

"1234567"

"abcdef"

"12 34 567 32"

If you need any further context, I will gladly provide so.

Thanks in advance

int main()
{
    int i = 0;

    std::regex rx("([[:digit:]]\\s)+([[:digit:]]\\s)+");
    std::string line = "1 2 3 4 5 6 7 8 9 10";
    std::smatch m;
    std::vector<std::string> catchit;

    while (regex_search(line, m, rx))
    {
        std::cout << "Pattern found " << m[i] << '\n';
        catchit.push_back(m[i]);
        line = m.suffix().str();
        i++;
    }
    return 0;
}

Answer 1

This solves my problem without having to use regex, thank you very much @Nick

Why not std::cin? Or wrap your output from getline in a std::stringstream and use operator>> to read numbers one at a time and validate them then? Eg std::stringstream stream(line); /* loop */ stream >> val; if (val < 0 || val > 11)...