【C++】 split函数实现方法

Honour Van

已于 2022-02-14 15:10:07 修改

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文章标签： c++ 开发语言后端

于 2022-02-14 14:55:51 首次发布

原文链接：https://stackoverflow.com/questions/14265581/parse-split-a-string-in-c-using-string-delimiter-standard-c

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单个分隔符的方法：

template<typename Delim>
string get_word(istream& ss, Delim d)
{
    string word;
    for (char ch; ss.get(ch); )    // skip delimiters
        if (!d(ch)) {
            word.push_back(ch);
            break;
        }
    for (char ch; ss.get(ch); )    // collect word
        if (!d(ch))
            word.push_back(ch);
        else
            break;
    return word;
}

vector<string> split(const string& s, const string& delim)
{
    stringstream ss(s);
    auto del = [&](char ch) { for (auto x : delim) if (x == ch) return true; return false; };

    vector<string> words;
    for (string w; (w = get_word(ss, del))!= ""; ) words.push_back(w);
    return words;
}

auto words = split("Now! Here is something different; or is it? ", "!.,;? ");
for (auto& w : words) cout << w << '\n';

字符串作为分隔符的方法：

std::string s = "scott>=tiger>=mushroom";
std::string delimiter = ">=";

size_t pos = 0;
std::string token;
while ((pos = s.find(delimiter)) != std::string::npos) {
    token = s.substr(0, pos);
    std::cout << token << std::endl;
    s.erase(0, pos + delimiter.length());
}
std::cout << s << std::endl;

参考：
https://stackoverflow.com/questions/14265581/parse-split-a-string-in-c-using-string-delimiter-standard-c
https://stackoverflow.blog/2019/10/11/c-creator-bjarne-stroustrup-answers-our-top-five-c-questions/?_ga=2.12029236.1470301215.1644821442-611235899.1620389838