Hi,

[This is the first time I use character classes in Emacs, so my
apologies if this is not an Emacs bug, but a misinterpretation.]

Recipe from "emacs -Q":
  C-M-s [ : a l p h a : ]

I expected to see all letters highlighted [1], but only some of them
are (see attached screenshot).


--- Footnotes ---
[1] I've checked "(elisp) Char Classes".


-- 
Dani Moncayo