{

std::regex e;

std::cmatch what;

virtual bool set_expression(const char* pe, bool isperl)

{

try

{

e.assign(pe, isperl ? std::regex::ECMAScript : std::regex::extended);

}

catch(const std::exception&)

{

return false;

}

return true;

}

virtual bool match_test(const char* text);

virtual unsigned find_all(const char* text);

virtual std::string name();

struct initializer

{

initializer()

{

std_regex::register_instance(boost::shared_ptr<abstract_regex>(new std_regex));

}

void do_nothing()const {}

};

static const initializer init;

{

std::regex_iterator<const char*> i(text, text + std::strlen(text), e), j;

unsigned count = 0;

while(i != j)

{

++i;

++count;

}

return count;

{

init.do_nothing();

return "std::regex";