Update runtime files.
diff --git a/runtime/syntax/vim.vim b/runtime/syntax/vim.vim
index ae7983f..b6ac6b5 100644
--- a/runtime/syntax/vim.vim
+++ b/runtime/syntax/vim.vim
@@ -1,8 +1,8 @@
" Vim syntax file
" Language: Vim 8.0 script
" Maintainer: Charles E. Campbell <NdrOchipS@PcampbellAfamily.Mbiz>
-" Last Change: Sep 26, 2018
-" Version: 8.0-20
+" Last Change: Mar 08, 2019
+" Version: 8.0-21
" URL: http://www.drchip.org/astronaut/vim/index.html#SYNTAX_VIM
" Automatically generated keyword lists: {{{1
@@ -217,7 +217,7 @@
" =========
syn cluster vimOperGroup contains=vimEnvvar,vimFunc,vimFuncVar,vimOper,vimOperParen,vimNumber,vimString,vimRegister,vimContinue
syn match vimOper "\%#=1\(==\|!=\|>=\|<=\|=\~\|!\~\|>\|<\|=\)[?#]\{0,2}" skipwhite nextgroup=vimString,vimSpecFile
-syn match vimOper "\(\<is\>\|\<isnot\>\)[?#]\{0,2}" skipwhite nextgroup=vimString,vimSpecFile
+syn match vimOper "\(\<is\|\<isnot\)[?#]\{0,2}\>" skipwhite nextgroup=vimString,vimSpecFile
syn match vimOper "||\|&&\|[-+.]" skipwhite nextgroup=vimString,vimSpecFile
syn region vimOperParen matchgroup=vimParenSep start="(" end=")" contains=@vimOperGroup
syn region vimOperParen matchgroup=vimSep start="{" end="}" contains=@vimOperGroup nextgroup=vimVar,vimFuncVar