string:substr

C++ Reference

substr

Syntax:

    #include <string>
    string string::substr(size_type index, size_type length = npos);

The substr() method returns a substring of the current string, starting at index, and length characters long.

If index + length is past the end of the string, then only the remainder of the string starting at index will be returned.

If length is omitted, it will default to string::npos, and the substr() function will simply return the remainder of the string starting at index.

For example:

     string s("What we have here is a failure to communicate");
     string sub = s.substr(21);
     cout << "The original string is " << s << endl;
     cout << "The substring is " << sub << endl;

displays

     The original string is What we have here is a failure to communicate
     The substring is a failure to communicate