Find total occurrences/count in string in PL/SQL

DECLARE
   count_                    NUMBER;
   count_with_ignore_case_   NUMBER;
   data_                     CLOB;
BEGIN
   data_ := 'The REGEXP_LIKE condition uses the input character set to evaluate strings.
If you specify match_parameter values that conflict, the REGEXP_LIKE condition will use the last value to break the conflict.
If the match_parameter is omitted, the REGEXP_LIKE condition will use the case-sensitivity as determined by the NLS_SORT parameter.';

   count_                  := REGEXP_COUNT(data_, 'the');
   count_with_ignore_case_ := REGEXP_COUNT(LOWER(data_), LOWER('the'));
   
   Dbms_Output.Put_Line('Exact Count: ' || count_);
   Dbms_Output.Put_Line('  All Count: ' || count_with_ignore_case_);
END;

Useful Links:

> Oracle / PLSQL: REGEXP_COUNT Function