the package is named STR and has to be placed in the SYS schema to be used anywhere in the database. Just compile it as sys then make a public synonym of it. Then you will be able to use functions this way:

select str.<thefunction>(<parameters>) from dual;

Here is a couple of cool stuffs that could be realized with this package (for full details download the package)

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Function will split a string.  The maximum size returnable
is 4000 bytes and up to 15 fields.
For Exammple:

SQL> select str.split(‘a,b,c,d’,3,’,') from dual;
STR.SPLIT(‘A,B,C,D’,3,’,')
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c

select str.split(‘a,b,c,d’,3,’,') from dual;
@param in_del_field             string to be split
@param in_position              position of split character(s) to return
@param in_del                   delimter to split by
@return Returns a single value from a string, up to 4K long

FUNCTION split
(in_del_field  IN     VARCHAR2,
in_pos        IN     NUMBER,
in_del        IN     VARCHAR2)
RETURN VARCHAR2;

Type is a collection/array of values returned from the split_array function

TYPE tab_split IS TABLE OF VARCHAR2(4000);

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Funciton takes a string passed to it and returns it as a collection of the
type tab_split.  For Example

DECLARE
t_split str.tab_split := str.split_array('a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z',',');
i       INTEGER;
BEGIN
FOR i IN t_split.FIRST .. t_split.LAST LOOP
DBMS_OUTPUT.PUT_LINE(t_split(i));
END LOOP;
END;

@param in_del_field             string to be split
@param in_del                   delimter to split by
@return Returns an Array of type str.tab_split with a row for each delimited value in in_del_field.

FUNCTION split_array
(in_del_field  IN     VARCHAR2,
in_del        IN     VARCHAR2)
RETURN tab_split;

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Funciton takes a table of string passed to it and returns it as a delimited string.  For Example
DECLARE
t_split str.tab_split := str.split_array('a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z',',');
i       INTEGER;
BEGIN
FOR i IN t_split.FIRST .. t_split.LAST LOOP
DBMS_OUTPUT.PUT_LINE(t_split(i));
END LOOP;
END;

@param in_tab                   table to unsplit
@param in_del                   delimter to concat
@return Returns an Varchar2 string delimited by the in_del var passed.

FUNCTION unsplit_array
(in_tab  IN     tab_split,
in_del        IN     VARCHAR2)
RETURN VARCHAR2;

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Function replace a string in a delimited string at the position passed in parameter.  For Example
select str.replace_at_pos(‘a,b,c,d,e,f,g,h,i’,2,’z',’,') from dual;
/
a,z,c,d,e,f,g,h,i
@param in_del_field             delimited string
@param in_pos                   position where to replace string
@param in_text                  string to put in place at pos
@param in_del                   delimter to split by
@return Returns an Varchar2 string delimited by the in_del var passed.

FUNCTION replace_at_pos
(in_del_field  IN     VARCHAR2,
in_pos        IN     NUMBER,
in_text       IN     VARCHAR2,
in_del        IN     VARCHAR2)
RETURN VARCHAR2;

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Pipelined Function returns a table of one column with the deleminted string
passed to it.  For example, you could do the following to return a table of
the alphabet…

SELECT *
FROM TABLE(str.split_pipe('a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z',','))

@param in_del_field             string to be split
@param in_del                   delimter to split by
@return Returns a Piplined Table of Table Type tab_str with a row for each delimited value in in_del_field.
FUNCTION split_pipe
(in_del_field  IN     VARCHAR2,
in_del        IN     VARCHAR2)
RETURN tab_str PIPELINED;

download the package Download STR package (277)