std::regex_iterator<BidirIt,CharT,Traits>::operator*,operator->

From cppreference.com
const value_type& operator*() const;
(1) (since C++11)
const value_type* operator->() const;
(2) (since C++11)

Extracts the current std::match_results from a regex_iterator:

1) Returns a reference to the current std::match_results.
2) Returns a pointer to the current std::match_results.

Example