To delete the characters only at the beginning of a string using regexp_replace

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  Hi I want to do, remove the consecutive occurrence of string
  
  

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  WITH T
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  Hello

  1006112 wrote:
  Hello
  The solution does not work for this channel.

  SELECT REGEXP_REPLACE ('ZHOU JIANCHUAN AND ESTABROOK- ZHOU DESIREE ','([^ ]+)( \1)+', '\1') Word1,
  regexp_replace('ZHOU JIANCHUAN AND ESTABROOK- ZHOU DESIREE', '(\w+)(\W+\1)+', '\1')Word1,
  regexp_replace('ZHOU JIANCHUAN AND ESTABROOK- ZHOU DESIREE', '(\w+\W+)\1+', '\1')Word3
  from dual ;
  
  SELECT REGEXP_REPLACE ('STATTELMAN J J JR AND MARGAR ','([^ ]+)( \1)+', '\1') Word1,
  regexp_replace('STATTELMAN J J JR AND MARGAR', '(\w+)(\W+\1)+', '\1')Word1,
  regexp_replace('STATTELMAN J J JR AND MARGAR', '(\w+\W+)\1+', '\1')Word3
  from dual  
  

  Your original solution looking better all the time! This problem is more complicated than I thought.
  It is probably more effective than CONNECT BY:

  SELECT    TRIM ( REGEXP_REPLACE ( REGEXP_REPLACE ( ' ' || REPLACE ( str
                                                               , ' '
                                            , '  '
                                            )
                                       || ' '
                                        , ' ([^ ]+)( +\1)+ '
                                  , ' \1'
                                 )
                      , ' +'
                      , ' '
                       )
              )     AS no_consecutive_dups
  FROM      table_x
  ORDER BY  str
  ;
  

  I tested it using this table:

  CREATE TABLE  table_x
  (   str     VARCHAR2 (80)
  );
  
  INSERT INTO  table_x (str) VALUES ('POWELL    POWELL BRIAN K AND BONNIE POWELL JARRELL JARRELL');
  INSERT INTO  table_x (str) VALUES ('ZHOU JIANCHUAN AND ESTABROOK- ZHOU DESIREE ');
  INSERT INTO  table_x (str) VALUES ('STATTELMAN J J JR AND MARGAR');
  INSERT INTO  table_x (str) VALUES ('DO DO SOL SOL LA LA SOL');
  

  Output:

  NO_CONSECUTIVE_DUPS
  --------------------------------------------------------------------------------
  DO SOL LA SOL
  POWELL BRIAN K AND BONNIE POWELL JARRELL
  STATTELMAN J JR AND MARGAR
  ZHOU JIANCHUAN AND ESTABROOK- ZHOU DESIREE
  

  It compresses the spaces; in other words, the original str can contain multiple consecutive spaces or spaces main and/or end, but the output will not.
  Here's how it works:
  The REGEXP_REPLACE at the heart of this solution search a sequence that begins and ends with a space. otherwise, he'll be fooled by things like "J J JR", where the "J" in "JR" could be confused with a 3rd 'J '. However, this means that a single space between two recurring motifs in 'DO DO GROUND GROUND' can only mark the end of "DOING" pattern or the Spiderbeam of the 'GROUND FLOOR' trend, but not both. The above query that bypasses by replacing all the spaces with 2 spaces, so space may mark the end of 'DOING' and the other may mark the beginning of "GROUND FLOOR".

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