string regex function added

ml_string.cpp

@@ -49,6 +49,55 @@ std::vector<std::string> regexp_strsplit(const std::string &string_to_split, con
 	return elems;
 }
 
+
+std::vector<std::string> regexp_match(const std::string &str, const std::string &reg_ex, bool case_sensitive) {
+	std::vector<std::string> matches;
+
+	std::regex pars_regex(reg_ex); // , (case_sensitive ? std::regex::basic : std::regex::basic|std::regex::icase));
+	auto words_begin = std::sregex_iterator(str.begin(), str.end(), pars_regex);
+	auto words_end = std::sregex_iterator();
+
+	for (std::sregex_iterator i = words_begin; i != words_end; ++i) {
+		std::smatch match = *i;
+		matches.push_back(match.str());
+	}
+
+	return matches;
+}
+
+std::vector<std::vector<std::string>> regexp_tokens(const std::string &str, const std::string &reg_ex, bool case_sensitive) {
+	std::vector<std::vector<std::string>> captured_groups;
+	std::vector<std::string> captured_subgroups;
+
+	std::smatch res;
+	std::regex exp(reg_ex); // , (case_sensitive ? std::regex::basic : std::regex::basic|std::regex::icase));
+	std::string::const_iterator searchStart(str.cbegin());
+	while (std::regex_search(searchStart, str.cend(), res, exp)) {
+		captured_subgroups.clear();
+		if (res.size() == 1) { // no subgroups
+			captured_subgroups.push_back(res[0]);
+		} else {
+			for (size_t i = 1; i < res.size(); ++i) { // [0] is whole match
+				captured_subgroups.push_back(res[i]);
+			}
+		}
+		if (captured_subgroups.size() > 0)
+			captured_groups.push_back(captured_subgroups);
+
+		searchStart += res.position() + res.length();
+	}
+	return captured_groups;
+}
+
+std::vector<std::vector<std::string>> regexp_search2(const std::string &string_to_split, const std::string &rgx_str, bool match_mode, bool ignore_case) {
+	if (match_mode) {
+		std::vector<std::vector<std::string>> matches{regexp_match(string_to_split, rgx_str, ignore_case)};
+		return matches;	
+	} else {
+		return regexp_tokens(string_to_split, rgx_str, ignore_case);
+	}
+}
+
 std::string string_lucase(std::string s, const std::string &strcase) {
 	if (strcase == "upper")
 		std::transform(s.begin(), s.end(),s.begin(), ::toupper);