Update invalid characters in database using regexp_replace

I have a table in which a column has invalid characters like ` Is it possible to update this using regexp_replace with correct character '?
Thanks

Thank You Volder this works.
I also need to replace if testcol has CHR(10) or CHR(11) with CHR(20) can this be done with one single regexp_replace? I don't want to use multiple regexp_replace statements one after the other.
like
update test set testcol = REGEXP_REPLACE(testcol, CHR(10), CHR(11) , CHR(20));
Thank You very much!

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