file_name_extension/3

Availability:built-in

file_name_extension(?Base, ?Extension, ?Name)

This predicate is used to add, remove or test filename extensions. The main reason for its introduction is to deal with different filename properties in a portable manner. If the file system is case-insensitive, testing for an extension will also be done case-insensitive. Extension may be specified with or without a leading dot (.). If an Extension is generated, it will not have a leading dot.