The following code example is taken from the book
The C++ Standard Library - A Tutorial and Reference, 2nd Edition
by Nicolai M. Josuttis, Addison Wesley Longman, 2012
Copyright © 2012 by Pearson Education, Inc. and Nicolai M. Josuttis
#include <string>
#include <regex>
#include <iostream>
using namespace std;
int main()
{
string data = "<person>\n"
" <first>Nico</first>\n"
" <last>Josuttis</last>\n"
"</person>\n";
regex reg("<(.*)>(.*)</(\\1)>");
// iterate over all matches
auto pos=data.cbegin();
auto end=data.cend();
smatch m;
for ( ; regex_search(pos,end,m,reg); pos=m.suffix().first) {
cout << "match: " << m.str() << endl;
cout << " tag: " << m.str(1) << endl;
cout << " value: " << m.str(2) << endl;
}
}