Function to remove stopwords from string

Hello

I would use a very effective feature that eliminates all the empty words of a given string (array of empty words: select distinct spw_word from ctxsys.ctx_stopwords).
Any help will be much appreciated.

Kind regards
MR. R.

Hello

Seems good! I would suggest a few changes in the body:

BEGIN
    mystr := ' ' || str || ' ' ;               -- See note 1

    FOR cr IN c
    LOOP
        mystr := REPLACE ( mystr
                       , ' ' || cr.x || ' '
                       , ' '                    -- See note 2
                );
    END LOOP;                              -- See note 3

    mystr := TRIM ( REGEXP_REPLACE ( mystr          -- See notes 1 and 2
                                  , ' {2,}'     -- 2 or more spaces
                       , ' '     -- 1 space
                       )
             );
    RETURN  mystr;
END f_replace_stopword;

Notes:
(1) not to clutter the code with a lot of unnecessary trimming. Before entering the loop, you must make sure that mystr begins and ends with a space, because of the problem of 'mother is in chemotherapy' as mentioned William. However, if the chain has already spaces here, is not what anyone let them hurt. The same goes for storage mystr each pass through the loop. The amount of resources, it's waste is small (if it's to lose, anyway), but I'm more concerned with having unnecessary code distract people from the real business of the function. All the extra spaces can be picked up at the end, after leaving the loop.

(2) so-called "FUBAR" is one of the empty words that you remove, and the string contains 'A FUBAR B. If you remove just the empty word (with its spaces added), which will leave you with "AB". I guess you want 'A B', with a space between what were originally two different words. This would be particularly important if the empty word "AB" happened to appear later in the list.
This can cause multiple consecutive spaces being left in mystr; additional spaces can be deleted once the loop is completed.

(3) If you do not use an OPEN statement to open the cursor, then you don't need a statement CLOSE to close. Leaving a LOOP FOR cursor automatically closes the cursor.

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