Searching for a whole word within a sentence

Question

I am trying to search for a whole word only in a sentence. The problem is if I use CS then I get things that contain the string in other words. If I use CO or CP then there is no match because there are other words in the sentence. I don't think it's practical to split the sentence into individual words and then compare each word as the sentence is of an unknown length and could be made up of many words.
An example:
Sentence 1 - THIS IS ABOUT RF OUTPUTS.
Sentence 2 - THIS IS ABOUT MY PERFORMANCE
The user wants to search for sentences containing RF. In this search I only want sentence 1 to be found and not the RF in the word performance in sentence 2.
Can anyone tell me how to do this.
Many thanks
Karen

Answer 1

DATA: str1(50),
      str2(50),
      srchstr(10).
DATA: BEGIN OF st_str,
        str(50),
      END OF st_str.
DATA: it_tab LIKE TABLE OF st_str WITH HEADER LINE.
str1 = 'THIS IS ABOUT RF OUTPUTS RF'.
str2 = 'THIS IS ABOUT MY PERFORMANCE RF'.
srchstr = 'RF'.
SPLIT str1 AT space INTO TABLE it_tab.
LOOP AT it_tab WHERE str = srchstr.
  WRITE : srchstr.
  WRITE 'found in'.
  WRITE 'str1'.
  EXIT.
ENDLOOP.
CLEAR it_tab[].
SPLIT str2 AT space INTO TABLE it_tab.
LOOP AT it_tab WHERE str = srchstr.
  WRITE : srchstr.
  WRITE 'found in'.
  WRITE 'str2'.
  EXIT.
ENDLOOP.
Check this code as it solves the leading RF and trailing RF problem .