string:rfind

rfind

Syntax:

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

The rfind() function returns the location of the last occurrence of str in the current string, doing a reverse search starting at index:

string::npos if nothing is found
starting at zero-based position index counted from the start of the string
searching at most num characters from the end

For example, in the following code, the first call to rfind() returns string:: npos, because the target word is not within the first 8 characters of the string. However, the second call returns 9, because the target word is within 20 characters of the beginning of the string.

     string::size_type loc;
     string s = "My cat's breath smells like cat food.";
     loc = s.rfind( "breath", 8 );
     cout << "The word breath is at index " << loc << endl;
     loc = s.rfind( "breath", 20 );
     cout << "The word breath is at index " << loc << endl;