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jdMorgan - 7:24 pm on Feb 7, 2011 (gmt 0)
# Replace encoded "?" characters with literal "?" characters
RewriteCond %{THE_REQUEST ^[A-Z]+\ /([^%]*)\%(25)*3[fF]([^\ ]+)\ HTTP?
RewriteRule ^ http://www.example.com/%1?%3 [R=301,L]
The (25)*3[fF] allows for multiply-encoded question marks, encoded using upper- or lower-case "F".
Jim