Dynamic extract from right

Hi All,

Please share any function or idea to extract file name from right left.From the below path, File name will change dynamically ( using wait_for_file function to get the file name but it is returning complete path )  and I need to extract only the file name which is before "/" from right.

$GV_FILE_NAME /test/eRW/MainFrame/Acknowledge_Files/Correct_Confirm_1.TXT