I recently noticed some incoming 404 error hits from URLs with their hashtag escaped.
Correct URL structure:
http://example.org/#!/thepage
or /index.html#!/thepage
Escaped/ Incorrect URL:
http://example.org/%23!/thepage
I tried the following .htaccess rule with little success:
RewriteEngine on
RewriteRule ^%23!/(.*)$ /index.html#!/$1 [NE]