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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 }
Eureka! Give me a lever long enough ... Eppur si muove Mr. Watson – Come here – I want you Mary had a little lamb That's one small step for a man ... SCE to AUX I think I'll stop here
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