Playing with formatlistpat regexp atoms

Hi all!

After discovering great formatlistpat I started to play with, increasing
it with my needs. But I found a problem regarding atoms, specifically
the or operator (|) of them. See this problem:

set formatlistpat=\\(\\a\\d\\)\\.

This formatlistpat works for lists like "a2." "b7." and so on, but if I
insert a "\\|" it stops to interpret it:

set formatlistpat=\\(\\a\\|\\d\\)\\.

This doesn't work.

Also, not escaping "|" is not an option since it interprets it as part
of vimscript.

How can I make this work?

Thank you very much!

--
Silas Silva

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