String function in oracle plz help

Question

my input parameter is p1:=%01%01%01
p2:= 5
and my out put should like as below
(%01%01%01nn)

Answer 1

Or create function:
create function url_encoded_rpad( p_str   in varchar2
                                 ,p_count in integer
                                 ,p_char  in varchar2)
return varchar2 is
begin
   return rpad( p_str
                   ,length(p_str)+p_count-length(regexp_replace(p_str,'%([0-9a-fA-F]{2})','X'))
               ,p_char);
end;Test:
with t as (
          select '%01%01%01' a from dual union all
          select '%01a%01' a from dual union all
          select '%D1%D1%01' a from dual union all
          select 'abc' a from dual union all
          select '%01%02%03%04' a from dual union all
          select 'a%01%01%01' a from dual
select a
      ,url_encoded_rpad(a,5,'n')
from tRegards,
Malakshinov Sayan