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compile visual studio c++ online
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#include <string> #include <regex> #include <iostream> int test_regex_search(const std::string& input,int*t) { std::regex rgx("(([:punct:]*)[[:alnum:]]+([:punct:]*))"); std::smatch match; if (std::regex_search(input.begin(), input.end(), match, rgx)) { std::cout << " matched = " << match[0] << " \n " ; *t+=(int)(match[0].second._Ptr-input.begin()._Ptr) ; return match[0].second-match[0].first; } else return (*t=0); } int main() { const std::string sentence = "ab cd ef"; int letters=0,words=0,ret=0,length=(int)(sentence.length()); do { letters+=test_regex_search(&sentence.at(ret),&ret); words+=!!ret; } while((ret!=0)&(ret<length)); std::cout << " letters= " << letters << " words= " << words; }
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Compilation time: 1.17 sec, absolute running time: 0.08 sec, absolute service time: 1.26 sec
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matched = ab matched = cd matched = ef letters= 6 words= 3