Syntax:

    #include <string>
    size_type find_last_not_of( const string& str, size_type index = npos ) const;
    size_type find_last_not_of( const Char* str, size_type index = npos ) const;
    size_type find_last_not_of( const Char* str, size_type index, size_type num ) const;
    size_type find_last_not_of( Char ch, size_type index = npos ) const;

The find_last_not_of() function either:

• returns the index of the last character within the current string that does not match any character in str, doing a reverse search from index, string::npos if nothing is found,
• returns the index of the last character within the current string that does not match any of the first num characters in str, doing a reverse search from index, string::npos if nothing is found,
• returns the index of the last character within the current string that does not match ch in the current string, doing a reverse search from index, string::npos if nothing is found.

For example, the following code searches for the last non-lower-case character in a mixed string of characters:

    string lower_case = "abcdefghijklmnopqrstuvwxyz";
    string str = "abcdefgABCDEFGhijklmnop";
    cout << "last non-lower-case letter in str at: " << str.find_last_not_of(lower_case) << endl;

This code displays the following output:

    last non-lower-case letter in str at: 13

Related Topics: find, find_first_not_of, find_first_of, find_last_of, rfind