apache - mod_rewrite - change URL case

Question

Is there any straightforward way to change the case of any URL using mod_rewrite?

I thought this was pretty trivial... apparently not.

Examples:

http://example.com/id to http://example.com/ID

http://example.com/id/123 to http://example.com/ID/123

and so forth.

Answer 1

mod_rewrite has some internal functions you can use for a mapping. One of them is toupper that converts letters to uppercase:

RewriteMap uppercase int:toupper

RewriteRule [a-z] %{uppercase:%{REQUEST_URI}} [L,R=301]