.htaccess URL-Rewrite-Rule for Magento Cached Images to the REAL Image-URL

Need to figure out that search engines like google/bing etc. get indexed only the real product url. So rewrite: [login to view URL] To: [login to view URL] There are several different formats like image,small_image,thumbnail which are going to be cached in Magento folder. Need to think about the "17f82f742ffe127f42dca9de82fb58b1" <md5 hash does it going to be changed after flush image cache or not?! If yes, think should be possible to set condition for 32 chars between / and one char /z followed by and / after that. Logically Idea: Check url after /cache/ and further 3x / and use the actual 32 chars (md5 hash: 17f82f742ffe127f42dca9de82fb58b1) and add the rest of url after it. Note: The cached images should be still used on website for serving the real visitors faster.