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$string =~ tr/\x00-\x09\x0b\x0c\x0e-\x1f//d;
if ($string =~ m/^([a-zA-Z0-9_])$/)
my $safeString = $1; ### also untainted now
By rote learning.
Via Genetic memory.
It's provided by my firmware.
I just remember them.
Thirty days hath September
My computer gets it right, usually.
I just ask someone else.
Someone punches me on the first of the month.
Results (210 votes),