I don't know what the problem is, but I can suggest some ways of cleaning up your code.
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&& $stock_symbol ne "" is useless since your regexp will never match an empty string.
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Also, $stock_symbol = $1; is useless, since you're capturing the entirety of the regexp.
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Finally, length($stock_symbol) < 11 can be removed by replacing the + in the regexp with {1,11}.
What follows is what you get when you apply the above cleanups:
$stock_symbol = $INPUT->param('stock_symbol');
if (!$stock_symbol =~ /^[-\@\w.]{1,11}\z/) {
print "Invalid Symbol!\n";
exit;
}
Update: Oops, $ can match before a trailing newline. Changed $ to \z to fix.
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