Changing <.Ext> capitalization for folder name

[S0 B00sted]

I have a fairly simple question but unfortunately Google hasn't been very helpful so I'm turning here for help.

I'm wondering if there's any sort of function to output a tag in all uppercase. My personal use case is that I want to have the file extension in my folder names when automatically organizing my files. Right now I'm using <.Ext> which works, however the output is all lowercase (i.e. "flac" instead of "FLAC"). Is there any sort of function I'm missing that I can use to make the tag output in all uppercase for the purpose of the title? Something similar to $uppercase(<.Ext>) or any other way this can be achieved?

Thank you!

EDIT: Of course mere minutes after posting this I am able to find the answer. For the record, the functions are $Upper and $Lower. For example, $Upper(<.Ext>)