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SELECT REGEXP_REPLACE (SUBSTR('123 453 6987', 1, LENGTH('123 453 6987')-4), '\d', '0') || SUBSTR('123 453 6987', -4, 4) PROCESSED_STRING FROM dual;
PROCESSED_STRING
000 000 6987
SELECT REGEXP_REPLACE (SUBSTR('Rio De janerio', 1, LENGTH('Rio De janerio')-4), '\S', '#') || SUBSTR('Rio De janerio', -4, 4) PROCESSED_STRING FROM dual;
PROCESSED_STRING
### ## ###erio