How to Split a String in C++?

Time：2020-09-09 13:16:32
Class：Weblog
Read：28

In C++, there is no inbuilt split method for string. It is very useful to split a string into a vector of string. We can use the following string split method to split a string into a vector or string using the stringstream class.

vector<string> split(const string& text) {
    string tmp;
    vector<string> stk;
    stringstream ss(text);
    while(getline(ss,tmp,' ')) {
        stk.push_back(tmp);
    }
    return stk;
}

vector<string> split(const string& text) {
    string tmp;
    vector<string> stk;
    stringstream ss(text);
    while(getline(ss,tmp,' ')) {
        stk.push_back(tmp);
    }
    return stk;
}

Example usage:

int main() {
  string str = "This is me";
  vector<string> words = split(str);
  // words = ["This", "is", "me"];
  for (const auto &n: words) {
     cout << n << endl;
  }
}

int main() {
  string str = "This is me";
  vector<string> words = split(str);
  // words = ["This", "is", "me"];
  for (const auto &n: words) {
     cout << n << endl;
  }
}

And of course, you can easily add the support for custom delimiter such as split a string by comma or colon (IP addresses):

vector<string> split(const string& text, char delimiter) {
    string tmp;
    vector<string> stk;
    stringstream ss(text);
    while(getline(ss,tmp, delimiter)) {
        stk.push_back(tmp);
    }
    return stk;
}

vector<string> split(const string& text, char delimiter) {
    string tmp;
    vector<string> stk;
    stringstream ss(text);
    while(getline(ss,tmp, delimiter)) {
        stk.push_back(tmp);
    }
    return stk;
}

Let’s hope that a string split function will be added to the string class in future C++ releases!

–EOF (The Ultimate Computing & Technology Blog) —

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