You can do this without a regex quite easily. How about this:

$uri = 'http://www.merchandisemarket.net/shop/s_images/aaa_small.gif';
$i = rindex($uri, '/') + 1;                    # Starting at the chara
+cter one after the last slash,
$filename = substr($uri, $i, length($uri)-$i); # get a substring with 
+the rest of the string
[download]

kelan

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