php - Should be a simple mod

this rule not seem functioning, cannot determine why, looks fine me:

rewriterule ^shop_en/proddetail.php?prod=(.+)$ /shop/product/$1 [l,nc,ne,r=301]

its not processed @ all, sites error message stating cannot find 'proddetail.php'.

which weird too, because on quick test tried following:

rewriterule ^shop_en/proddetail.php$ /shop/product [l,nc,r=301]

which worked fine. going on?

edit: product id's working can contain letters, numbers , dashes.

in simplest terms, convenient definitions:

i want route trying access:

www.domain.com/shop_en/proddetail.php?prod=333

to following url:

www.domain.com/shop/product/333

how can this?

try this

rewriterule ^/?shop/product/([a-za-z0-9\-]+)$ shop_en/proddetail.php?prod=$1 [l,nc,ne,r=301]

EXIT