std::match_results::size? ??? ????, ?? ??? ???? ?? ??? ??????

std ::match_results::size C 11? ??? ?? ?? ?? ?? ?? ?? ?? 1? ?? ?? ?????. ??? ?????

<code class="cpp">#include <iostream>
#include <string>
#include <regex>

int main() {
    std::string haystack("abcdefabcghiabc");
    std::regex needle("abc");
    std::smatch matches;
    std::regex_search(haystack, matches, needle);
    std::cout << matches.size() << std::endl;
}

??? "abc"? ?? ??? ? ? ????? ??? 3? ? ??? ??? ? ????. ??? ??? ??? 1???. ?? regex_search? ?? ?? ??? ???? size()? ?? ?? ?? ?? ?? ?? ?? ?? ???? ?????.

? ???? ?? ??? ???? ?? ??? ????. size()? ?? ?? ?? ?? 1? ?????. ?? ???? "abc"? ???? ??? ?? ???? ?? ?? ??? ?? std::regex_search ??? ??? ? ????.

<code class="cpp">int main() {
    std::string haystack("abcdefabcghiabc");
    std::regex needle("abc");
    std::vector<std::smatch> matches;
    std::regex_search(haystack, needle, matches, std::regex_constants::match_continuous);
    std::cout << matches.size() << std::endl;
}

? ??? ?? ???? "abc"? ???? ?? ??? ?????. ?? ??? ?????. ??? size() ??? ??? ?? ?? ?? ????, ? ???? 3???.

?? ???

?? ?? ??? ?? ?? ??? ????. ???. ? ?? ??? std::sregex_iterator? ???? ????:

<code class="cpp">int main() {
    std::regex r("ab(c)");
    std::string s = "abcdefabcghiabc";
    for (std::sregex_iterator i = std::sregex_iterator(s.begin(), s.end(), r);
            i != std::sregex_iterator();
            ++i) {
        std::smatch m = *i;
        std::cout << "Match value: " << m.str() << " at Position " << m.position() << '\n';
        std::cout << "    Capture: " << m[1].str() << " at Position " << m.position(1) << '\n';
    }
    return 0;
}

? ??? ??? ?????:

Match value: abc at Position 0
    Capture: c at Position 2
Match value: abc at Position 6
    Capture: c at Position 8
Match value: abc at Position 12
    Capture: c at Position 14

? ?? ??? std::regex_match ??? ???? ????:

<code class="cpp">int main() {
    std::regex r("abc");
    std::string s = "abcdefabcghiabc";
    std::vector<std::string> matches;
    std::smatch match;
    while (std::regex_search(s, match, r)) {
        matches.emplace_back(match[0]);
        s = match.suffix().str();
    }
    std::cout << matches.size() << std::endl;
}</code>

? ??? 3? ?????.

? ??? `std::match_results::size`? ???? ?? ?? ?? ???? ?? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!