Using c++ regex to create a match all function which returns the matched element and the position

regex_match_all.cpp

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

auto match_all(std::string input, const std::string& pattern) noexcept {
    std::vector<std::pair<std::string, int>> matches{};

    try {
        const std::regex self_regex(pattern);//, std::regex_constants::ECMAScript | std::regex_constants::icase);
        std::smatch m;
        uint64_t positionFix{};

        while (std::regex_search(input, m, self_regex)) {       
            matches.emplace_back(m.str(), positionFix + m.position());
            input = m.suffix();
            positionFix += m.position() + m.length();
        }
    }
    catch (const std::regex_error& e) {
        std::cout << "regex_error caught: " << e.what() << '\n';
    }

    return matches;
}


 int main() {
    const std::string test{"Hello {{ name }}{{ surname }} How are things with you?"};    
    auto result = match_all(test, "(\\{\\{|\\{%|\\{#(\\-|~)?)");

    for (auto const& [match, position]: result) {
        std::cout << "Match : " << match << " position: " << position << '\n';
    }
}