I just accidentally copypasted a wget command into the ebay search box and got the following error:
It happens with
wget http://google.com or
curl http://google.com, or any other URL...
It does seem to sanitise the input and remove slashes if you just enter a URL but not if you precede it with wget or curl. What could they possibly be doing which causes a wget or curl command to bypass their sanitization and produce a different result?