Copy a file and rename using Regex?

Hi

I want to be able to copy a file and append some text to the new file's name using Regex, how would I go about this?

Essentially I want to copy say:

My File.jpg

And have the copy be called:

My File_thumbnail.jpg

Any help would be appreciated!

Regards
Matt

Maybe instead you want to use the internal Copy command with wildcards, such as:

Copy DUPLICATE PATTERN . AS _thumbnail.

Thanks! That works well enough for what I want!