SQL & PL/SQL

Hello,

I am using Oracle 11.2 and do fuzzy search as following:

Create table tb_test(Nm varchar2(32));

create index fuzzy_idx on tb_test(Nm) indextype is ctxsys.context parameters(' Wordlist STEM_FUZZY_PREF');

select * from tb_test where contains(Nm, 'fuzzy(Wndy,,,weight)',1) >0;

The query works fine for hardcoded string 'Wndy'. I just wonder how can I use parameter to pass the match string in PLSQL?

Thanks,