Recognise some character if arent between word

Hi to All.
I want to replace some character (in this case & / . , :
-) if they
arent between two word.
I recognise the string "aaa&aaa" and the
string "aaaaa&" but not the
string "&aaaaa".
How I must modify this regexp
(?<!\w)?[&/.,:-](?!\w)

thanks 

--
Andrea


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RE: **I recognise the string "aaa&aaa" and
the string "aaaaa&" but not
the
string "&aaaaa".  **

But the ampersand in string aaaaa&" is NOT between
two alphanymeric
chars, right? And u still 'recognize' it like u do in case
of
'aaa&aaa'. How is that? To me It is a wrong logic.


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