.htaccess rewrite

Hi i need to write a .htaccess file that can forward all urls such as

example.com/file/file/filename-dp7
or
example.com/file/file/filename-dp3
or
example.com/file/file/filename-dp17

to
example.com/file/file/filename


any ideas? i presume it would use mod_rewrite, with Regular expressions, but im a bit stumped...

anyone got any ideas?

Thanks

Calum

RewriteRule ^file/file/filename-db[0-9]+ /file/file/filename [L]