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// match_results::swap
// - using smatch, a standard alias of match_results<string::iterator>
#include <iostream>
#include <string>
#include <regex>
int main ()
{
std::string s ("There is a needle in this haystack.");
std::smatch m1,m2;
std::regex_search ( s, m1, std::regex("needle") );
std::regex_search ( s, m2, std::regex("haystack") );
m1.swap(m2);
std::cout << m1.format("m1 contains [$0].") << std::endl;
std::cout << m2.format("m2 contains [$0].") << std::endl;
return 0;
}
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