#include <iostream>
#include <string>
#include <regex>
int main(int argc, char *argv[])
{
std::wstring str = L"Приветпривет";
std::wsmatch result;
std::wregex regex(L"[А-я]+");
bool res = regex_match(str.cbegin(), str.cend(), result, regex);
std::cout << std::boolalpha << res << std::endl;
}
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