how to match these urls?

[kevin]

requests like these are hitting my server, and i want to catch these
requests, and return 'not found' from nginx. i dont want it to hit my
fastcgi backend.

[13/Aug/2010:19:39:26 -0700]  "POST /%5C%22http:%5C/%5C/
photos-b.ak.fbcdn.net%5C/photos-ak-snc1%5C/v43%5C/64%5C/68931197560%5C/app_2_68931197560_3211.gif%5C%22
HTTP/1.1" 404 103 "-" "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5;
en-US; rv:1.9.2.8) Gecko/20100722 Firefox/3.6.8" 0.087 US


how do i match requests with url starting like this:

/%5C%22http:%5C/%5C/



thanks!
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