實(shí)現(xiàn)字符串split的6種方法
時(shí)間:2025-12-02 22:31:45
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方法1:stringstream和getline配合使用
std::vector<std::string> stringSplit(const std::string& str, char delim) { std::stringstream ss(str); std::string item; std::vector<std::string> elems; while (std::getline(ss, item, delim)) { if (!item.empty()) { elems.push_back(item); } } return elems;}
方法2:使用std::string::find
std::vector<std::string> stringSplit(const std::string& str, char delim) { std::size_t previous = 0; std::size_t current = str.find(delim); std::vector<std::string> elems; while (current != std::string::npos) { if (current > previous) { elems.push_back(str.substr(previous, current - previous)); } previous = current + 1; current = str.find(delim, previous); } if (previous != str.size()) { elems.push_back(str.substr(previous)); } return elems;}
方法3:使用std::string::find_first_of
std::vector<std::string> stringSplit(const std::string& str, char delim) { std::size_t previous = 0; std::size_t current = str.find_first_of(delim); std::vector<std::string> elems; while (current != std::string::npos) { if (current > previous) { elems.push_back(str.substr(previous, current - previous)); } previous = current + 1; current = str.find_first_of(delim, previous); } if (previous != str.size()) { elems.push_back(str.substr(previous)); } return elems;}
方法4:使用C語言的strtok方法
std::vector<std::string> stringSplit(const std::string& strIn, char delim) { char* str = const_cast<char*>(strIn.c_str()); std::string s; s.append(1, delim); std::vector<std::string> elems; char* splitted = strtok(str, s.c_str()); while (splitted != NULL) { elems.push_back(std::string(splitted)); splitted = strtok(NULL, s.c_str()); } return elems;}
方法5:std::string::find_first_of和std::string::find_first_not_of配合使用
std::vector<std::string> stringSplit(const std::string& str, char delim) { std::vector<std::string> elems; auto lastPos = str.find_first_not_of(delim, 0); auto pos = str.find_first_of(delim, lastPos); while (pos != std::string::npos || lastPos != std::string::npos) { elems.push_back(str.substr(lastPos, pos - lastPos)); lastPos = str.find_first_not_of(delim, pos); pos = str.find_first_of(delim, lastPos); } return elems;}
方法6:使用正則表達(dá)式
std::vector<std::string> stringSplit(const std::string& str, char delim) { std::string s; s.append(1, delim); std::regex reg(s); std::vector<std::string> elems(std::sregex_token_iterator(str.begin(), str.end(), reg, -1), std::sregex_token_iterator()); return elems;}





