Take a second look at the regex he used.

if ($file_name !~ /\.jpe?g$/)

The way he's using it covers both .jpg as well as .jpeg extensions in case the user tries to upload with either extension. However Trimbach, you might consider adding a "?" after the "g" as well, because as rare as it really is, .jpe is also an acceptable extension used with jpegs.

ryddler