[Feature] Support Vim RegEx token to match anything "\_."

[bartelmarkus]

Issue type

• Enhancement request

Environment

Emacs version: GNU Emacs 29.4 (build 2, x86_64-w64-mingw32) of 2024-07-05 Operating System: Windows 10 Evil version: 1.15.0 Evil installation type: MELPA Graphical/Terminal: Graphical Tested in a make emacs session (see CONTRIBUTING.md): No

Reproduction steps

• Start Emacs
• make sure that evil-ex-search-vim-style-regexp is set to t
• Create a new buffer with the content

foo
bar
baz

Expected behavior

• Run search with f\_.*ba
• Match:

foo
bar
ba

• In the background, the token is transpiled to Emacs Lisp RegEx \\(.\\|\n\\) or [^z-a] or something similar that does the trick
• Compare the anything token from rx: It compiles to [^z-a]

Actual behavior

• Can't parse the token \_. like Vim does, nothing is found
• only workaround constructs are possible like an alternation with the f\(.\|\n\).*ba, because the dot itself doesn't match newline characters

Further notes

The original Vim feature is documented in :h \_.