Replace multiple whitespaces in a string with single one

Question

Hi,
I'm using Oracle 9.2.0 and I have a query on string manipulation.
Can I replace multiple whitespaces within a string with single one. I tried with regexp_replace function but it is not supporting Oracle 9i.
Can someone help me out?
Regards,
Pramod

Answer 1

Just playing around:
WITH
     Strings
AS
      SELECT 'Can  I   replace      multiple  whitespaces   within    a     string    with single one' Text FROM Dual
SELECT
     REPLACE
      REPLACE
       XMLAGG
        XMLElement
         "A",
         SubStr(Text, Level, 1)
       '</A>'
      '<A>'
     ) Text
FROM
     Strings
WHERE
     NOT
          Level > 1
      AND     SubStr(Text, Level, 1)          = ' '
      AND     SubStr(Text, Level - 1, 1)     = ' '
CONNECT BY
     Level <= LENGTH(Text);