/usr/share/nvim/runtime/syntax/ctrlh.vim is in neovim-runtime 0.2.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | " Vim syntax file
" Language: CTRL-H (e.g., ASCII manpages)
" Maintainer: Bram Moolenaar <Bram@vim.org>
" Last Change: 2005 Jun 20
" Existing syntax is kept, this file can be used as an addition
" Recognize underlined text: _^Hx
syntax match CtrlHUnderline /_\b./ contains=CtrlHHide
" Recognize bold text: x^Hx
syntax match CtrlHBold /\(.\)\b\1/ contains=CtrlHHide
" Hide the CTRL-H (backspace)
syntax match CtrlHHide /.\b/ contained
" Define the default highlighting.
" Only used when an item doesn't have highlighting yet
hi def link CtrlHHide Ignore
hi def CtrlHUnderline term=underline cterm=underline gui=underline
hi def CtrlHBold term=bold cterm=bold gui=bold
" vim: ts=8
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