The Gallery macro should have the ability to not only sort but also filter the files it will display.

You can already select images to include (or exclude), but that only takes a comma-separated list of exactly specified filenames, and the point of a gallery macro is to easily display a bunch of images without writing their full name. (Maybe the name is unknown, e.g. when creating templates).

E.g. let's say I want to display a gallery with all files beginning with "idea*" (e.g. idea1.png, idea2.png, etc) at the top of my page, while at the same time have a gallery at the bottom with files named "result*.png". Note that I might also have other files that I do not want to display, e.g. "balance.png, zero-selection.png and results-details.jpg".

It would also be very useful if it was possible to filter by comment (as well as filename - both at the same time), e.g. displaying all images with the word "good" or "NMR" in the comment.