What is the mean of the following syntax?

William Torrez Corea <[email protected]>
Newsgroups gmane.comp.lang.perl.beginners
Message-ID <CAGiORHdPRFLtNUmcz31WN1Dai1bP_0fJS48zsjNng1MBFcKmRw@mail.gmail.com> 
Mean: !~ /\*/

I have the following code:

if ($extension !~ /\*/) {
$backup = $ARGV . $extension;
}


-- 

With kindest regards, William.

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