no matching function for call to ‘regex_search(…)'

Question

Given an old-style const char * pointer and a length, is there a way to call std::regex_search() on it without first copying the contents of the bu

Answer 1

The error in your code is that you're using the wrong match_results type. smatch is supposed to be used when you have an std::string object and you're passing std::string::iterators to the regex function. When you have raw char const *s use cmatch instead.

Change

std::smatch what;

to

std::cmatch what;

Live demo