【Boost】boost::string_algo详解6——replace相关函数

replace的主要函数(以及其包括的copy函数)包括:
replace_range, replace_first, replace_last, replace_nth, replace_head, replace_tail, replace_regex, replace_all, replace_all_regex

void test_string_replace()
{
	using namespace boost;
	std::string str = "Hello Dolly, Hello World!";

	std::cout << "#### replace_range ####" << std::endl;
	{
		std::string str1 = str;
		replace_range(str1, make_iterator_range(str1.begin() + 2, str1.end() - 2), "!!!");
		std::cout << str1 << std::endl;
	}
	std::cout << std::endl;

	std::cout << "#### replace_first and replace_first_copy ####" << std::endl;
	{
		std::string str2 = str;
		replace_first(str2, "Hello", "GoodBye");
		std::cout << str2 << std::endl;
	}
	{
		std::string str2 = str;
		std::string strc1 = replace_first_copy(str2, "Hello", "GoodBye");
		std::cout << strc1 << std::endl;

		std::string strc2 = "result = ";
		replace_first_copy(back_inserter(strc2), str, "Hello", "GoodBye");
		std::cout << strc2 << std::endl;
	}
	std::cout << std::endl;

	std::cout << "#### replace_last and replace_last_copy ####" << std::endl;
	{
		std::string str3 = str;
		replace_last(str3, "Hello", "GoodBye");
		std::cout << str3 << std::endl;
	}
	{
		std::string str3 = str;
		std::string strc1 = replace_last_copy(str3, "Hello", "GoodBye");
		std::cout << strc1 << std::endl;

		std::string strc2 = "result = ";
		replace_last_copy(back_inserter(strc2), str, "Hello", "GoodBye");
		std::cout << strc2 << std::endl;
	}
	std::cout << std::endl;

	// 注意nth的索引从0开始.
	std::cout << "#### replace_nth and replace_nth_copy ####" << std::endl;
	{
		std::string str4 = str;
		replace_nth(str4, "Hello", 1, "GoodBye");
		std::cout << str4 << std::endl;
	}
	{
		std::string str4 = str;
		std::string strc1 = replace_nth_copy(str4, "Hello", 1, "GoodBye");
		std::cout << strc1 << std::endl;

		std::string strc2 = "result = ";
		replace_nth_copy(back_inserter(strc2), str, "Hello", 1, "GoodBye");
		std::cout << strc2 << std::endl;
	}
	std::cout << std::endl;

	std::cout << "#### replace_all and replace_all_copy ####" << std::endl;
	{
		std::string str5 = str;
		replace_all(str5, "Hello", "GoodBye");
		std::cout << str5 << std::endl;
	}
	{
		std::string str5 = str;
		std::string strc1 = replace_all_copy(str5, "Hello", "GoodBye");
		std::cout << strc1 << std::endl;

		std::string strc2 = "result = ";
		replace_all_copy(back_inserter(strc2), str, "Hello", "GoodBye");
		std::cout << strc2 << std::endl;
	}
	std::cout << std::endl;

	std::cout << "#### replace_head and replace_head_copy ####" << std::endl;
	{
		std::string str6 = str;
		replace_head(str6, 5, "GoodBye");
		std::cout << str6 << std::endl;
	}
	{
		std::string str6 = str;
		std::string strc1 = replace_head_copy(str6, 5, "GoodBye");
		std::cout << strc1 << std::endl;

		std::string strc2 = "result = ";
		replace_head_copy(back_inserter(strc2), str, 5, "GoodBye");
		std::cout << strc2 << std::endl;
	}
	std::cout << std::endl;

	std::cout << "#### replace_tail and replace_tail_copy ####" << std::endl;
	{
		std::string str6 = str;
		replace_tail(str6, 6, "GoodBye");
		std::cout << str6 << std::endl;
	}
	{
		std::string str6 = str;
		std::string strc1 = replace_tail_copy(str6, 6, "GoodBye");
		std::cout << strc1 << std::endl;

		std::string strc2 = "result = ";
		replace_tail_copy(back_inserter(strc2), str, 6, "GoodBye");
		std::cout << strc2 << std::endl;
	}
	std::cout << std::endl;

	std::cout << "#### replace_regex, replace_regex_copy ####" << std::endl;
	{
		std::string str6 = str;
		regex reg("H.*?o");

//		replace_regex(str6, reg, "GoodBye");	// 直接这么写会报错. 要用如下的方法.
		std::string strReplace = "GoodBye";
		replace_regex(str6, reg, strReplace);

		std::cout << str6 << std::endl;
	}

	{
		std::string str6 = str;
		regex reg("H.*?o");
		std::string strReplace = "GoodBye";
		std::string strc1 = replace_regex_copy(str6, reg, strReplace);
		std::cout << strc1 << std::endl;

		std::string strc2 = "result = ";
		replace_regex_copy(back_inserter(strc2), str, reg, strReplace);
		std::cout << strc2 << std::endl;
	}
	std::cout << std::endl;

	std::cout << "#### replace_all_regex, replace_all_regex_copy ####" << std::endl;
	{
		std::string str6 = str;
		regex reg("H.*?o");
		std::string strReplace = "GoodBye";
		replace_all_regex(str6, reg, strReplace);
		std::cout << str6 << std::endl;
	}
	{
		std::string str6 = str;
		regex reg("H.*?o");
		std::string strReplace = "GoodBye";
		std::string strc1 = replace_all_regex_copy(str6, reg, strReplace);
		std::cout << strc1 << std::endl;

		std::string strc2 = "result = ";
		replace_all_regex_copy(back_inserter(strc2), str, reg, strReplace);
		std::cout << strc2 << std::endl;
	}
	std::cout << std::endl;
}