How to match latin letters + their accented versions?

Question

\a is equivalent to [A-Za-z] so it matches only non-accented letters.

I know of [=name-of-equivalence-class=], so I can clearly use something like \(\a\|[[=a=][=e=][=i=][=o=][=u=]]\), but I was wondering whether there was a more fundamental solution, such as an option to automatically match every element of the equivalance class for each character in the pattern.

The reason why I would have expected a less hand-crafted solution is that other options doing something similar exist, such as \c/\C and \Z.

I haven't found anything in :help pattern.

Answer 1

I've discovered the \k character class, which matches anything that is in 'iskeyword', which can in turn be set iskeyword=@, where the meaning of @ is explained at isfname:

If the character is '@', all characters where isalpha() returns TRUE are included. Normally these are the characters a to z and A to Z, plus accented characters.

Which is precisely what I need.

So one way to accomplish the task is to use \k instead of \a and set iskeyword=@ when the behavior described in the question is needed, e.g. when entering search mode.