SAP/ABAP: SPLIT

DATA: P_PARAM(11) TYPE C,
      LV_FIRST(10),
      LV_LAST(3).

P_PARAM = 'example.txt'.

SPLIT  P_PARAM AT '.' INTO LV_FIRST LV_LAST.

IF LV_LAST NE 'txt'.
  MESSAGE 'Yanlış dosya türü!' TYPE 'I'.
ELSE.
  MESSAGE 'OK!' TYPE 'S'.
ENDIF.