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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.

[edit] Return value

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

[edit] Example

#include <iostream>
#include <regex>
#include <string>
 
int main()
{
    std::string hay{"1.1a2b3cjk34"};
    std::regex needle("[1234]");
    using Ri = std::regex_iterator<std::string::iterator>;
    for (Ri it{hay.begin(), hay.end(), needle}, last{}; it != last; ++it)
        std::cout << it->str();
    std::cout << '\n';
}

Output:

112334