how to replace inverse question mark in Oracle sql

The columns contain the inverse question marks. Want to replace them with a space. How to do that?

select c1 from t;

From ¿ aaaa ascd, this ¿ test
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slightwv (䄆 Netminder) Commented:
Depending on the character sets involved, try this:
regexp_replace(c1,'[^[:alnum:]]') from t;
Mark GeerlingsDatabase AdministratorCommented:
Or, the simple "replace" operator may work for you:

select replace(c1,'¿',' ') "C1_Spaced" from t1;

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jl66ConsultantAuthor Commented:
Thanks a lot.
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