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#include<iostream>
#include<regex>
#include<string>
using namespace std;

int main()
{
   bool found;
   cmatch m;
try
{
    found = regex_search("<html>blah blah blah </html>",m,regex("<.*>.* </\1"));
    cout<< found<<endl<<m.str();
}
catch(exception & e)
{

    cout<<e.what();
}

return 0;


}

#include<iostream>
#include<regex>
#include<string>
using namespace std;

int main()
{
    bool found;
    cmatch m;
    try
    {
        found = regex_search("<html>blah blah blah </html>",m,regex("<(.*)>(.*)</\1>"));
        cout << "***whole match***n";
        cout << "found=" << found << endl;
        cout << m.str() << endl;

        cout << "n*** parts ***" << endl;
        for (const auto& c : m) {
            cout << c << endl;
        }

    }
    catch(exception & e)
    {

        cout<<e.what() << endl;
    }

    return 0;


}

***whole match***
found=1
<html>blah blah blah </html>

*** parts ***
<html>blah blah blah </html>
html
blah blah blah