regex edit for ++

string testString = "22.5 + 5.5i";
	vector<double> test;
	smatch matches;
	regex regexString("((\\d*)[.](\\d*))");
	size_t sz;


	while (regex_search(testString, matches, regexString)){
	test.push_back(stod(matches[0], &sz));
	matches.empty();
	testString = matches.suffix().str();
	}
	for (auto ele : test) {
		cout << ele << endl;
	}