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#include <string>
#include <iostream>
#include <regex>
using namespace std;
int main()
{
cout << "Empty pattern to quit, empty target to specify new pattern\n";
while (true)
{
string pat;
cout << "Pattern: ";
getline(cin, pat);
if (pat.empty())
break;
while (true)
{
cout << "Target: ";
string target;
getline(cin, target);
if (target.empty())
break;
regex re(pat);
smatch sm;
cout << "Before the match: empty = " << sm.empty() << '\n';
regex_search(target, sm, re);
cout << sm.size() << '\n';
for (size_t idx = 0; idx != sm.size(); ++idx)
cout << sm[idx] << '\n';
cout << "After the match: empty = " << sm.empty() << '\n';
for (auto &m: sm)
cout << "sub match: " << m << '\n';
while (true)
{
cout << "Which match position (empty for none)? ";
string str;
getline(cin, str);
if (str.empty())
break;
cout << "nr " << str << ": " << sm.str(stoul(str)) <<
'\n';
}
}
}
}
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