Alternation regex, C++ (clang)

Alternation regex

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

int main()
{
	std::string line = "abcde";
	{
		const std::string RX_ION_TYPE("ab?|ab?(?:cd|dc)");

const auto regexType = std::regex::ECMAScript;

std::regex rx_ionType;

rx_ionType.assign(
			"(" + RX_ION_TYPE + ")"
			, regexType);

std::smatch match;

if (std::regex_search(line, match, rx_ionType))
		{
			for (int i = 0; i < match.size(); i++)
			{
				std::cout << "|" << match.str(i) << "|\n";
			}

}
		else
		{
			std::cout << "No match.\n";
		}
	}

{
		const std::string RX_ION_TYPE("ab?(?:cd|dc)|ab?");

const auto regexType = std::regex::ECMAScript;

std::regex rx_ionType;

rx_ionType.assign(
			"(" + RX_ION_TYPE + ")"
			, regexType);

std::smatch match;

if (std::regex_search(line, match, rx_ionType))
		{
			for (int i = 0; i < match.size(); i++)
			{
				std::cout << "|" << match.str(i) << "|\n";
			}

}
		else
		{
			std::cout << "No match.\n";
		}
	}
	{
		const std::string RX_ION_TYPE("ab?(?:cd|dc)?");

const auto regexType = std::regex::ECMAScript;

std::regex rx_ionType;

rx_ionType.assign(
			"(" + RX_ION_TYPE + ")"
			, regexType);

std::smatch match;

if (std::regex_search(line, match, rx_ionType))
		{
			for (int i = 0; i < match.size(); i++)
			{
				std::cout << "|" << match.str(i) << "|\n";
			}

}
		else
		{
			std::cout << "No match.\n";
		}
	}

return 0;
}


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