So, here’s my attempt

The first portion (^.?$) matches all lines of 0 or 1 characters.

The second portion (^(..+?)\1+$) is more complicated:

1. (..+?) is a capture group that matches the first character in any line, followed by a smallest possible non-zero number of characters such that (2) still matches (note that the minimum length of this match is 2)
2. \1+ matches as many as possible (and more than 0) repeats of the (1) group

I think what this does is match any line consisting of a single character with the length

• divisible by some number (due to the more than 0 condition in (2), so that there have to be repeats in the string), that’s not
  • 1 (due to the note in (1), so that the repeating portion has to be at least 2 characters long), or
  • the length itself (due to the more than 0 condition in the (2), so that there is at least one repetition)

Therefore, combined with the first portion, it matches all lines of the same character whose lengths are composite (non-prime) numbers? (it will also match any line of length 1, and all lines consisting of the same string repeated more than one time)

I haven’t used it in a while, but I think it just sends you an SMS with a code that you can enter manually, so yeah it works on devices without a SIM

I mean, yeah, it’s nix profile install nixpkgs#vscode and it should kinda work. Although to run it, you might have to also do nix profile install github:nix-community/nixgl --impure and then run vscode as nixGL code because of video driver awfulness.

There are android phones that are even thicker, with amazing battery life and fall protection. Check out DOOGEE for example.

Me

My gf

Not OP, but this looks like 3D Relief (requires OpenGL render) + Terrain (Avalanche mode) + Contour Lines + Weather Plug-in. My setup is quite similar, and I also have an optional satellite/aerial imagery layer, a Hiking map style, and quick actions set up to toggle all those on or off when I need to declutter the map. AFAIR all require Premium/Plus to use.

Here’s my profile if you want to quickly set it up in your app: https://share.balsoft.ru/OsmAnd-profile-balsoft.osf

Not sure if you’re the author, but I think a self.shortRev attribute is also provided, so that you don’t have to builtins.substring yourself.