utils: Add regex_callback_extractor()

utils.cpp

@@ -175,3 +175,14 @@ std::string utils::toISODate(time_t t)
 	}
 	return std::string{result};
 }
+
+void utils::regex_callback_extractor(std::regex regex, const std::string &input, std::function<void (std::smatch &)> callback)
+{
+	auto begin = std::sregex_iterator(input.begin(), input.end(), regex);
+	auto end = std::sregex_iterator();
+	for(auto it = begin; it != end; it++)
+	{
+		std::smatch smatch = *it;
+		callback(smatch);
+	}
+}

utils.h

@@ -60,6 +60,7 @@ template <class T, class U> std::vector<U> getAll(std::multimap<T, U> map, T key
 std::string regex_callback_replacer(std::regex regex, const std::string &input,
 									std::function<std::string(std::smatch &)> callback);
 
+void regex_callback_extractor(std::regex regex, const std::string &input, std::function<void(std::smatch &)> callback);
 std::string readCompleteFile(std::string_view filepath);
 
 inline std::string nz(const char *s)