SQL & PL/SQL

Hi everyone, i'll want to use query for to find all character special and extended ASCII codes on column

i have tried this records:

select * from char_speciale

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SURNAME NAME

SERPI!! GAB
SE£ GRA
ARA%%& sa
@dass dsadsa
ara€ ssa
gabriele dsa

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select * from char_speciale
where regexp_like(surname, '('|| chr(33) || '|'
|| chr(37) || ')')

---------------------------------
SURNAME NAME

SERPI!! GAB
ARA%%& sa

-------------------------------------------------------------------------------------------------------------

select * from char_speciale
where regexp_like(surname,'[[:punct:]]');

--------------------------------
SURNAME NAME

SERPI!! GAB
SE£ GRA
ARA%%& sa
@dass dsadsa
ara€ ssa

-------------------------------------------------------------------------------------------------------------

select * from char_speciale WHERE surname != ASCIISTR (surname)

----------------------------

SURNAME NAME

ara€ ssa
SE£ GRA


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but i don't see just query, because i'll want to find also extended ascii, for example german "o" or french "e", ecc.
on my table use NLS_CHARACTERSET: AL32UTF8

i don't know that i have insert just query but i'm not sure.... do have better solution? thank much