My understanding of very-magic regexes is that you can escape any character outside
[A-Za-z0-9_] with a backslash to make it match literally. However, I don't see that behaviour with CJK characters. For example, compare:
:echo match('中','\v中') " succeeds (returns 0) :echo match('中','\v\中') " fails (returns -1)
official GVim 7.4 Win32 with
+multi_lang. (Strangely, it does not show
+multi_byte, but UTF-8 editing works fine.)
Vim 8.0 with
+multi_langrunning in Cygwin through mintty 3.0.0.