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#include <string>
#include <iostream>
#include <regex>
#include <iterator>
using namespace std;
//code
bool modify(string const &match);
size_t replace(string &target, string::iterator begin, string match);
int main()
{
string target("... oh, when the Saints, ...");
regex re("\\w+");
smatch match;
size_t offset = 0;
while (true)
{
auto begin = target.begin() + offset;
if (not regex_search(string::const_iterator(begin),
target.cend(), match, re))
break;
size_t pos = match.position(0);
offset += pos +
modify(match[0]) ?
replace(target, begin + pos, match[0])
:
match.length(0);
}
cout << "new text: " << target << '\n';
}
//=
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