Beginner Url Rewrite htaccess

I would simply like to rewrite all requests from:

http://example.com/products/product.cfm?id=product-name

to

http://example.com/products/product-name

and 开发者_运维问答secondly,

http://example.com/category.cfm?id=some-category&sub=sub-category

to

http://example.com/some-category/sub-category

Here is what I’ve tried:

Options +FollowSymLinks
RewriteEngine on
RewriteRule ^products/$1 ^products/product.cfm?id=$1 [NC] 

I'm sure that makes no sense, as I really have no idea what I am doing. I was hoping someone could show me where I'm going wrong so I could follow by example.

Thanks! George

---

http://www.addedbytes.com/for-beginners/url-rewriting-for-beginners/

I don't like pure "link" answers, but the link above is extremely helpful to me :]

---

Using mod_rewrite, you could write:

RewriteRule ^products/([\w-]+)$ /products.cfm?id=$1&%{QUERY_STRING}

This will do the translation you wanted, while preserving other parameters in the original URL. It won't handle categories, but I'm not sure you can have those both in operation simultaneously as you described.

---

Something along these lines:

RewriteCond %{query_string} &?id=([^&]+) [NC] 
RewriteRule ^/products/product.cfm$ /products%1? [R,NC,L]

# Fragile, this assumes that params will always be in order id= then sub=
RewriteCond %{query_string} &?id=([^&]+)&sub=([^&]+) [NC] 
RewriteRule ^/category.cfm?$ /%1/%2? [R,NC,L]

The R flag in the RewriteRule forces a hard redirect (the visitor's location bar will change to the new URL). Remove this flag for an internal redirect.