C++ 分割字符串数据的实现方法

#include <sstream>

string keyValue = "WTH01#WTH02#WTH03#WTH04#WTH05"
string keys[6] = { "" };
stringstream is(keyValue);
string temp;
int index = 0;
while (getline(is, temp, '#'))
{
    keys[index] = temp;
    index++;
    cout << temp << endl;
}

string str1 = "This is a test";
string str2 = "This-is-a-test";
string str2 = "This+is+a+test";

// istream & getline(char* buf, int bufSize);	// 读到 \n 为止
istream & getline(char* buf, int bufSize, char delim); //读到 delim 字符为止
				// \n 或 delim 都不会被读入 buf，但会被从文件输入流缓冲区中取走

void Stringsplit(string str,const const char split)
{
	istringstream iss(str);	// 输入流
	string token;			// 接收缓冲区
	while (getline(iss, token, split))	// 以split为分隔符
	{
		cout << token << endl; // 输出
	}
}

void Stringsplit(string str,const const char split);
// 默认将传入的字符串str以split为分隔符进行分割，并将得到的子串打印在屏幕上，无返回值
void Stringsplit(string str, const const char split,vector<string>& rst);
// 默认将传入的字符串str以split为分隔符进行分割，    不会将子串打印在屏幕上，无返回值
// 					分割的子串将会保存在rst数组中被带出函数。

int main() {
	string str("This is a test");
	Stringsplit(str, ' ');		// 打印子串
	vector<string> strList;
	string str2("This-is-a-test");
	Stringsplit(str2, '-', strList);	// 将子串存放到strList中
	for (auto s : strList)
		cout << s << " ";
	cout << endl;
	return 0;
}

size_type find( const basic_string& str, size_type pos = 0 ) const;

basic_string substr( size_type pos = 0, size_type count = npos ) const;

// 使用字符分割
void Stringsplit(const string& str, const char split, vector<string>& res)
{
	if (str == "")		return;
	//在字符串末尾也加入分隔符，方便截取最后一段
	string strs = str + split;
	size_t pos = strs.find(split);
	// 若找不到内容则字符串搜索函数返回 npos
	while (pos != strs.npos)
	{
		string temp = strs.substr(0, pos);
		res.push_back(temp);
		//去掉已分割的字符串,在剩下的字符串中进行分割
		strs = strs.substr(pos + 1, strs.size());
		pos = strs.find(split);
	}
}
// 使用字符串分割
void Stringsplit(const string& str, const string& splits, vector<string>& res)
{
	if (str == "")		return;
	//在字符串末尾也加入分隔符，方便截取最后一段
	string strs = str + splits;
	size_t pos = strs.find(splits);
	int step = splits.size();
	// 若找不到内容则字符串搜索函数返回 npos
	while (pos != strs.npos)
	{
		string temp = strs.substr(0, pos);
		res.push_back(temp);
		//去掉已分割的字符串,在剩下的字符串中进行分割
		strs = strs.substr(pos + step, strs.size());
		pos = strs.find(splits);
	}
}

int main()
{
	vector<string> strList;
	string str("This-is-a-test");
	Stringsplit(str, '-', strList);
	for (auto s : strList)
		cout << s << " ";
	cout << endl;
	vector<string> strList2;
	string str2("This%20is%20a%20test");
	Stringsplit(str2, "%20", strList2);
	for (auto s : strList2)
		cout << s << " ";
	cout << endl;
	return 0;
}

char* strtok( char* str, const char* delim );

 char *strtok_r(char *str, const char *delim, char **saveptr); 。

void Stringsplit(const string& str, const string& split, vector<string>& res)
{
	char* strc = new char[str.size() + 1];
	strcpy(strc, str.c_str());   // 将str拷贝到 char类型的strc中
	char* temp = strtok(strc, split.c_str());
	while (temp != NULL)
	{
		res.push_back(string(temp));		
		temp = strtok(NULL, split.c_str());	// 下一个被分割的串
	}
	delete[] strc;
}

void Stringsplit(const string& str, const char split, vector<string>& res)
{
	Stringsplit(str, string(1,split), res);	// 调用上一个版本的Stringsplit()
}

int main()
{
	vector<string> strList;
	string str("This+is+a+test");
	Stringsplit(str, '+', strList);
	for (auto s : strList)
		cout << s << " ";
	cout << endl;
	vector<string> strList2;
	string str2("This-is-a-test");
	Stringsplit(str2, "-", strList2);
	for (auto s : strList2)
		cout << s << " ";
	cout << endl;
	return 0;
}

void Stringsplit(const string& str, const string& split, vector<string>& res)
{
	//std::regex ws_re("\\s+"); // 正则表达式,匹配空格 
	std::regex reg(split);		// 匹配split
	std::sregex_token_iterator pos(str.begin(), str.end(), reg, -1);
	decltype(pos) end;              // 自动推导类型 
	for (; pos != end; ++pos)
	{
		res.push_back(pos->str());
	}
}

int main()
{
	// 单个字符分词
	vector<string> strList;
	string str("This is a test");
	Stringsplit(str," ", strList);
	for (auto s : strList)
		cout << s << " ";
	cout << endl;
	// 使用字符串分词
	vector<string> strList2;
	string str2("ThisABCisABCaABCtest");
	Stringsplit(str2, "ABC", strList2);
	for (auto s : strList2)
		cout << s << " ";
	cout << endl;
}