1:  dbms_lob.instr(

2:  lob_loc in clob character set any_cs,

3:  pattern in varchar2 character set lob_loc%charset,

4:  offset in integer:=1,

5:  nth in integer := 1)

6:  return integer; 

7:   

 1:  dbms_lob.instr(

 2:  lob_loc in blob, 

 3:  pattern in raw, 

 4:  offset in integer := 1;

 5:  nth in integer := 1)

 6:  return integer; 

 7:  dbms_lob.substr(

 8:    lob_loc in blob, 

 9:    amount in integer := 32767,

10:    offset in integer := 1)

11:  return raw; 

12:  dbms_lob.substr(

13:    lob_loc in clob character set any_cs, 

14:    amount in integer := 32767,

15:    offset in integer := 1)

16:  return varchar2 character set lob_loc%charset; 

 1:  declare 

 2:     source_lob clob;

 3:     pattern varchar2(6) := 'Oracle';

 4:     start_location integer := 1;

 5:     nth_occurrence integer := 1;

 6:     position integer;

 7:     buffer varchar2(100);

 8:  begin

 9:     select clob_locator into source_lob from mylobs where lob_index = 4;

10:     position := dbms_lob.instr(source_lob, pattern, start_location, nth_occurrence);

11:     dbms_output.put_line('The first occurrence starts at position:' || position);

12:   

13:     nth_occurrence := 2;

14:     select clob_locator into source_lob from mylobs where lob_index = 4;

15:     position := dbms_lob.instr(source_lob, pattern, start_location, nth_occurrence);

16:     dbms_output.put_line('The first occurrence starts at position:' || position);

17:   

18:     select clob_locator into source_lob from mylobs where lob_index = 5;

19:     buffer := dbms_lob.substr(source_lob, 9, start_location);

20:     dbms_output.put_line('The substring extracted is: ' || buffer);

21:  end;