redirect old permalink to new permalink

Previously my permalink structure was /%category%/%postname%/ and their are already post made using that permalink, but then I have changed my permalink structure from above to /%postname%.html how can I redirect those post using the old permalink to the new one. using .htaccess. Because I got 404 pages and bots keeps on requesting the old links.

 

Try...

RewriteEngine On
RewriteRule ([^/]+)/(.*) $2.html [R=301]

Code (markup):

 

thanks, I will try it out

 

i have tried the code but i got problems since i have a folder in the host which is not part of wordpress thus all folder will be redirected also to http://www.yourdomain.com/.html so it is not working

 

RewriteEngine On
RewriteCond %{REQUEST_URI} !-d
RewriteCond %{REQUEST_URI} !-f
RewriteRule ([^/]+)/(.+) $2.html [R=301]

Code (markup):

Checks if the requested file/dir exists and only redirects if it doesn't.