Regex with backreference won't match in C++ -

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i'm trying match 4 equal characters in c++.

these supposed match = kqqqq, zzzzq

this i've tried far: 

std::string mano_to_reg = "kqqqq"; std::regex pokar("(.)\1{3}"); std::smatch match;  std::cout << "match = " << std::regex_match(mano_to_reg, match, pokar) << "\n";

but won't match.

i've tried std::regex_search , won't match either.

i've tried using basic , extend syntax

i've tried changing pattern "(.)\1{4}" , "((.)\1{3})" , every other combination of these.

i've tried matching other patterns other strings , of them work. seems problem backreference, i've looked everywhere , can't find why wont match.

i'm using clang++ 7.0.2 on os x 10.11.3 -std=c++11 -stdlib=libc++ flags.

i've tried g++ 5.3.0 -std=c++11 -std=gnu++11 flags.

you've got 2 problems:

  1. you need escape \. regex (.)\1{3} correct, in order store in string literal, need escape it's "(.)\\1{3}".
  2. you want std::regex_search instead of std::regex_match. string "kqqqq" not match regex (.)\1{3}, substring "qqqq" does.

the following program:

#include <iostream> #include <regex> #include <string>  int main() {     std::string mano_to_reg = "kqqqq";     std::regex pokar("(.)\\1{3}");     std::smatch match;      std::cout << "match  = " << std::regex_match(mano_to_reg, match, pokar) << "\n";     std::cout << "search = " << std::regex_search(mano_to_reg, match, pokar) << "\n"; }

outputs:

match  = 0 search = 1

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