How to remove words which consist of max 2 letters?

Question

Hi everybody,
Is it possible to remove words from string which consist of max 2 letters using REGEXP_REPLACE?
For example string is 'aa bbb cc dddd' and result should be ' bbb dddd' (3 spaces) or 'bbb dddd' (1 space). It does not matter which one of results.
Or exists another method to achieve this?
Thank you.
Matus.

Answer 1

Try this.. should work for even punctuations and digits etc.
It might be done more simpler but this is my try.
Combined Anthony Wilson and Tom kyte:-)
WITH t AS
     ( SELECT 'aaa''123 bb cc dddd l mmmm' l
        FROM DUAL )
SELECT     MAX ( SYS_CONNECT_BY_PATH ( word, ' ' )) scbp
      FROM ( SELECT word, ROWNUM rn
              FROM ( SELECT    REGEXP_SUBSTR ( l
                                             , '[[:alpha:][:graph:]]+'
                                             , 1
                                             , LEVEL
                                             ) word
                          FROM t
                    CONNECT BY LEVEL <=
                                    LENGTH ( REGEXP_REPLACE ( l, '[^ ]', '' ))
                                  + 1 )
             WHERE LENGTH ( word ) > 2 )
START WITH rn = 1
CONNECT BY PRIOR rn = rn - 1G.