REGEXP_REPLACE('This is a test', 't.+t','XYZ')
SQL> -- REGEXP_INSTR(String to search, Pattern, [Position, [Occurrence, [Return-option, [Parameters]]]])
SQL>
SQL> SELECT REGEXP_REPLACE('This is a test', 't.+t','XYZ') FROM dual;
REGEXP_REPLAC
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This is a XYZ
SQL>
SQL>
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