Need to rebuild string programmatically having '&' in it.

Question

Gurus,
I need to rebuild a string value programmatically which has '&' and insert the same into another table.
this info is being passed to one procedure which will insert the reqd details into one table.
Hence,procedure abc (p_input_id number,p_input_string varchar2) will be 2 input parameters.
The only point where i'm getting stuck is the way to handle multiple '&' in a particular string.
Now the string may contain n no of '&' occurrances.
Hence,can you suggest/modify the existing code so that it can be used in a general way.
Assume creating arrays permission is not granted to the schema.
Logic that i've used is :Find the sub-strings coming in between '&' and concat them with chr(38) which will give a '&'.
My Code :
SQL> declare
2 lv_count number;
3 i number:=1;
4 lv_len_str number;
5 lv_great number:=0;
6 lv_set_first varchar(1000):=null;
7 lv_set_curr varchar2(1000):=null;
8 lv_prev varchar2(1000):=null;
9 lv_set varchar2(1000):=null;
10 begin
11 select length(col2) into lv_len_str from abc where col1=5;
12 for a in 1..lv_len_str
13 loop
14 select instr(col2,'&',1,i) into lv_count from abc where col1=5;
15 exit when nvl(lv_count,0)=0;
16 i:=i+1;
17 end loop;
18 lv_great:=(i-1);
19 --dbms_output.put_line ('Highest occurrance : '||lv_great);
20 i:=1;
21 select substr(col2,1,instr(col2,'&',1,1)-1) into lv_set from abc where col1=5;
22 dbms_output.put_line ('First Set : '||lv_set);
23 lv_set_first:=lv_set||chr(38);
24 i:=1;
25 for a in 1..lv_great
26 loop
27 dbms_output.put_line ('Value of i here : '||i);
28 select substr(col2,instr(col2,'&',1,i)+1,(instr(col2,'&',1,i+1)-instr(col2,'&',1,i)-1)) into lv_set_curr from abc where col1=5;
29 -- dbms_output.put_line (lv_set);
30 i:=i+1;
31 lv_prev:=lv_set_first;
32 lv_set:=lv_prev||chr(38)||lv_set_curr;
33 dbms_output.put_line (lv_set);
34 exit when i>lv_great;
35 end loop;
36 --dbms_output.put_line ('Overall set : '||lv_set);
37 end;
38 /
First Set : filename=oracle.exe
Value of i here : 1
filename=oracle.exe&&filename2=123455
Value of i here : 2
filename=oracle.exe&&filename3=23456
Value of i here : 3
filename=oracle.exe&&
PL/SQL procedure successfully completed.
Desired Output :
filename=oracle.exe&filename2=123455&filename3=23456&filename4=test which is not happening.

Answer 1

Procedure abc (p_input_id number,p_input_string varchar2) will be 2 input parameters.
Input_id will be 1,2,3,4,etc
Input_string will be in the format abc#bcd#cde#def..so on ('#' is parser.. sort of delimiter)
Here 'abc' correspond to 'filename=oracle.exe&filename2=123455&filename3=23456&filename4=test'
'bcd' correspond to 'filename=oracle10g.exe&filename2=12345&filename3=23456'
'cde' correspond to 'filename=Java.zip&filename2=280648119&filename3=null'
'def' correspond to 'filename=c12kprp-boot-mz.120-33.S1.bin&filename2=278725201&filename3=null'
so on and so forth ...
Here is a table abc (col1 number,col2 varchar2(100)) which will store the values.
Now i want the result of procedure to store values find values between '#' and insert them with value of input_id
input_id : 1
input_string : filename=oracle.exe&filename2=123455&filename3=23456&filename4=test#filename=oracle10g.exe&filename2=12345&filename3=23456#filename=c12kprp-boot-mz.120-33.S1.bin&filename2=278725201&filename3=null
So the table abc would contain values filename=oracle.exe&filename2=123455&filename3=23456&filename4=test,
filename=oracle10g.exe&filename2=12345&filename3=23456,filename=c12kprp-boot-mz.120-33.S1.bin&filename2=278725201&filename3=null
against value of 1 in the table.
Now,if suppose, user happens to pass 4 strings for input_id which is 2,which can be
filename=c12kprp-boot-mz.120-33.S1.bin&filename2=278725201&filename3=null#filename=Java.zip&filename2=280648119&filename3=null#filename=oracle10g.exe&filename2=12345&filename3=23456#filename=oracle.exe&filename2=123455&filename3=23456&filename4=test, so all these strings separeted by # would be stored against value of 2 in table abc.
Let me know if you need any thing.