std::match_results::suffix

From cppreference.com
< cpplrm; | regexlrm; | match results
const_reference suffix() const;
(since C++11)

Obtains a reference to the std::sub_match object representing the target sequence between the end of the entire match of the regular expression and the end of the target sequence

The behavior is undefined unless ready() == true

Parameters

(none)

Return value

Reference to the unmatched suffix.

Example

#include <iostream>
#include <regex>
#include <string>

int main()
{
    std::regex re("a(a)*b");
    std::string target("baaaby");
    std::smatch sm;

    std::regex_search(target, sm, re);
    std::cout << sm.suffix().str() << '\n';
}

Output:

y