Merge patch series "some string cleanup, and a tweak of the "config" command"

Rasmus Villemoes <rv@rasmusvillemoes.dk> says:

This started by me wanting something like what patch 8 does. That
wasn't too hard, except we had no strcasestr(), and also our regex
engine (which I didn't really want to pull into the mix anyway)
doesn't have a flag that requests case-insensitive matching. So I
wanted to add strcasestr(), but then I stumbled on a bunch of stuff
that should be cleaned up in str-land.

Link: https://lore.kernel.org/r/20260708203711.849489-1-rv@rasmusvillemoes.dk