According to this random character table, ISO-8859 defines a character for every byte value. So there are no characters not defined in this charset.
Maybe you can show us a more concrete example of what you have, what you expect and the code you wrote already. Please also tell us how your code fails to produce the result you expect.
In reply to Re: Detect wrong characters
by Corion
in thread Detect wrong characters
by LexPl
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