SQL & PL/SQL :: Removing Special Characters And Get Desired Characters From Column Values

create table test
(
name varchar2(50),
descd varchar2(50)
)
insert into test values ('kethlin','da,dad!tyerx');
insert into test values ('tauwatson','#$dfegr');
insert into test values ('jennybrown','fsa!!trtw$ fda');
insert into test values ('tauwatson','#$dfegr ,try');

how do I get the first three characters and last three characters from name field and remove all the junk characters from descd field?

so my o/p be like;

Quote:('ketlin','dadadtyerx')
('tauson','dfegr')
('jenown','fsatrtw fda')
('tauson','dfegr try')