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    my $ext = "";
if ($imagename =~ s/(\.jpe?g|\.gif|\.png)\z//i) { # updated
...
}
$imagename =~ s/\W/_/g;  # updated 
$imagename = $imagename.$ext; # updated
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    -- 
Joost       downtime n. The period during which a system
            is error-free and immune from user input.