There aren't lists I know of, but the usual practice is to have a default deny...that is, strip out anything that you don't explicitly allow. So something like: 

my $text = $q->param('text');

# Removes any character that ISN'T a digit, word, or space character 
$text =~ s/[^\d\w\s]+//g;

[download]

In the end though, what characters to allow/disallow all depends on how you are using the data later. Maybe you could explain this more?

In reply to Re: Tainted or bad characters by The Mad Hatter
in thread Tainted or bad characters by bradcathey

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