>>> "SM" == Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> An “abbrev” is a word that has been defined to “expand” into a specified
>> “expansion”.  When you insert a word-separator character following the
>> abbrev, that expands the abbrev—replacing the abbrev with its expansion.
>> For example, if ‘foo’ is defined as an abbrev expanding to ‘find outer
>> otter’, then typing ‘f o o .’ will insert ‘find outer otter.’.
>> 
>> This mean a word-separator character cannot be part of an abbrev.

> That's true for the default behavior.
> Since Emacs-24, abbrev tables do support abbrevs whose name includes
> non-word characters, but it requires extra work on the part of the user
> in order to characterize the possible names via the `:regexp` property
> (see `C-h o define-abbrev-table`).

Thanks, I read the documentation but I am unable to figure out, what
regexp has to be used for that regexp I should use in order to make a
two word expansion work. 

All regexp I tried returned error.

So this 

(define-abbrev-table 'fundamental-mode-abbrev-table
  '(
    ("a que" "a qué" :regexp 1 :count 0)))


Does not return error but does not work as well.

May I suggest to add an example in the documentation of 

`C-h o define-abbrev-table`

Thanks