Fix SyntaxWarning for invalid escape sequence in regex

[nafg]

Use raw string (r'...') for regex pattern to avoid SyntaxWarning about invalid escape sequences like \w. This warning will become an error in future Python versions.

(I used Claude Code for this)

[nafg]

(I encountered the warning after enabling the nod rubber stamp)

[giggio]

I have tested it on NixOS 26.05. I also had the issue with rubberstamps. The patch fixed it.
For anyone else on NixOS, add this to your config:

{
  services = {
    howdy = {
      package = pkgs.howdy.overrideAttrs (old: {
        patches = (old.patches or [ ]) ++ [
          (pkgs.fetchpatch {
            url = "https://patch-diff.githubusercontent.com/raw/boltgolt/howdy/pull/1063.patch"; # fix regex issue on rubberstamps
            sha256 = "sha256-NkFcMW6VIs8uKz9A0+SFzZbjntQVOxZGwD9wyeiZ6dc=";
          })
        ];
      });
    };
  };
}

Thanks for the PR!