I've noticed that usually, Wordpress will name a scaled image copy by appending the resolution, like this:
Is this always the case? Are there any special circumstances where they would be named differently?
I ask because I have seen a few named after the image size name, like this:
I'm trying to come up with a simple regex to only show original images, so I'd like to know what rules Wordpress follows when naming these files. Can anyone enlighten me?