Replace asterisk between keywords with comma followed by a space?

[emjaysea]

I'm using Gallery Server Pro (GSP) to organize and index a large collection of images (over 10,000 images and growing).  GSP pulls image metadata to help index the images, so that one can do searches by keyword, or any field in the image metadata, really.  Some of the images I have have a comma and space between each keyword, while others have asterisks and no space.  The ones with the comma work fine in GSP, the others, not so much, it's like it doesn't see the keywords on those.  So, I'd like to do a find and replace on all the image IPTC keywords to replace the asterisks with comma/space.  Is this possible with ExifTool GUI (or perhaps with straight ExifTool)?  If so, how would I go about making it happen?

[Phil Harvey]

IPTC keywords should be stored separately, not as a delimited string.  FAQ 17 explains this and how to deal with it from the ExifTool command-line app.

- Phil