std::regex_token_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)

Returns a pointer or reference to the current match.

Return value

1) Returns a reference to the current match.
2) Returns a pointer to the current match.

The behavior is undefined if the iterator is end-of-sequence iterator.