.htaccess redirect with regular expressions

Scoochi2

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Hey, I'm pretty much a newb when it comes to .htaccess, so I hope someone out there can clarify something for me.

I have a PHP file that will spew out a png image, but due to forums not allowing dynamic images, I need to fool them by loading a png image which is redirected to my PHP file. This I can do.
However, the image is different, dependent on a $_GET in my PHP.

In short, I need to redirect from
http://mydomain/folder/xxxx.png to http://mydomain/folder/image.php?text=xxxx

I thought I could do it the following way (.htaccess file in top level). Could somebody clarify for me that this is correct, or if not, any other thoughts?

Code:
Options +FollowSymlinks
RewriteEngine on
RewriteRule ^folder/([^/]+).png /folder/image.php?text=$1 [NC]
 
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