Rewriting URL and MySQL Query -

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i'm looking understand something, , i've not find explanations this. read :

how rewrite url? , in answer, can find :

2) rewriting product.php?id=12 product/ipod-nano/12.html

seo expert suggest display main keyword in url. in following url rewriting technique can display name of product in url.

rewriteengine on rewriterule ^product/([a-za-z0-9_-]+)/([0-9]+)\.html$ product.php?id=$2

my question : how works ? how can retrieve words 'ipod-nano' rewriterule ????

does can me?


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