Replaces every vowel in given phrase(s) with "oodle"

oodle.cpp

// compile with:
// g++ oodle.cpp -o oodle -std=c++14

#include <iostream>
#include <string>
#include <regex>
#include <vector>

int main(int argc, char* argv[]) {
    if (argc == 1) {
        std::cout << "Usage: oddle [phrase ...]\n Replaces all vowels in given phrase(s) with 'oddle.'\n";
        return 0;
    }

    std::vector<std::string> phrases;
    std::string str;
    for (int i = 1; i < argc; i++) {
        str = std::string(argv[i]);
        phrases.push_back(str);
    }

    std::regex v("[aeiou]", std::regex::icase|std::regex::optimize);

    for (int i = 0; i < phrases.size(); i++) {
        phrases[i] = std::regex_replace(phrases[i], v, "oodle");
    }

    for (auto s : phrases) {
        std::cout << s << std::endl;
    }

    return 0;
}