How to Split a String in C++?

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;
}

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;
  }
}

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;
}

Another C++ string split implementation

Here is another C++ split implementation that goes through each character and split it by the delimiter.

vector<string> split(string path, char d) {
    vector<string> r;
    int j = 0;
    for (int i = 0; i < path.length(); i ++) {
        if (path[i] == d) {
            string cur = path.substr(j, i - j);
            if (cur.length()) {
                r.push_back(cur);
            }
            j = i + 1;
        }
    }
    if (j < path.length()) {
        r.push_back(path.substr(j));
    }
    return r;
}

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

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