QString str = "Hello World"; int pos = str.findRev("o"); // returns 7
QString str = "Hello World"; int pos = str.findRev("L", 4, Qt::CaseInsensitive); // returns 3In this example, the function starts the search from position 4 (counting from the end of the string) and searches backward for the substring "L" (case-insensitive). It returns the position of the last occurrence, which is 3. The QString class is part of the Qt Core module, so the package library is Qt.