// Finds the last index within a CharSequence, handling null. This method uses String.lastIndexOf(String) if possible.

System.out.println(StringUtils.lastIndexOf(null, null));       //StringUtils.indexOf(null, null) -> returns -1
System.out.println(StringUtils.lastIndexOf("LOREM", "LOREM"));      //StringUtils.indexOf("LOREM", "LOREM") -> returns 0
System.out.println(StringUtils.lastIndexOf("ababab", "ab"));      //StringUtils.indexOf("ababab", "ab") -> returns 4