regexp to abbrev table

[Leo]

Hello Stefan and all,

If I want abbrevs to contain symbol, word, or \ (desirable in TeX), how
to construct a :regexp to the abbrev table? (For example, in TikZ, \node
and node are both meaningful, so one would naturally want \n to expand
into \node and n to expand into node).

The abbrev itself should match \\(\\(\\sw\\|\\s_\\|\\s\\\\)+\\). Since
currently :regexp also needs to match part of the text before the
abbrev, how to prepend \\(\\(\\sw\\|\\s_\\|\\s\\\\)+\\) so that abbrevs
can be correctly found? Something similar to \\(\\Sw\\|\\S_\\|\\S\\\\)
but without adding the extra group.

Do you think using greedy looking-back in abbrev--before-point will make
creating the :regexp property easier?

Thanks,

Leo