正则表达式搜索和替换组在C ++？

Question

The best I can come up with is:

#include <boost/algorithm/string/replace.hpp>
#include <boost/regex.hpp>
#include <iostream>

using namespace std;

int main() {
    string dog = "scooby-doo";
    boost::regex pattern("(\\w+)-doo");
    boost::smatch groups;
    if (boost::regex_match(dog, groups, pattern))
        boost::replace_all(dog, string(groups[1]), "scrappy");

    cout << dog << endl;
}

with output:

scrappy-doo

.. is there a simpler way of doing this, that doesn't involve doing two distinct searches? Maybe with the new C++11 stuff (although I'm not sure that it's compatible with gcc atm?)

Answer 1

std::regex_replace should do the trick. The provided example is pretty close to your problem, even to the point of showing how to shove the answer straight into cout if you want. Pasted here for posterity:

#include <iostream>
#include <iterator>
#include <regex>
#include <string>

int main()
{
   std::string text = "Quick brown fox";
   std::regex vowel_re("a|e|i|o|u");

   // write the results to an output iterator
   std::regex_replace(std::ostreambuf_iterator<char>(std::cout),
                      text.begin(), text.end(), vowel_re, "*");

   // construct a string holding the results
   std::cout << '\n' << std::regex_replace(text, vowel_re, "[$&]") << '\n';
}