diff --git a/runtime/syntax/testdir/dumps/vim_variables_00.dump b/runtime/syntax/testdir/dumps/vim_variables_00.dump
index ecf420d..9794113 100644
--- a/runtime/syntax/testdir/dumps/vim_variables_00.dump
+++ b/runtime/syntax/testdir/dumps/vim_variables_00.dump
@@ -1,20 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/vim_variables_01.dump b/runtime/syntax/testdir/dumps/vim_variables_01.dump
new file mode 100644
index 0000000..f1ce29d
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_variables_01.dump
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diff --git a/runtime/syntax/testdir/dumps/vim_variables_02.dump b/runtime/syntax/testdir/dumps/vim_variables_02.dump
new file mode 100644
index 0000000..8f31c47
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_variables_02.dump
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diff --git a/runtime/syntax/testdir/dumps/vim_variables_03.dump b/runtime/syntax/testdir/dumps/vim_variables_03.dump
new file mode 100644
index 0000000..3260c37
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_variables_03.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/vim_variables_04.dump b/runtime/syntax/testdir/dumps/vim_variables_04.dump
new file mode 100644
index 0000000..97d240c
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_variables_04.dump
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diff --git a/runtime/syntax/testdir/dumps/vim_variables_05.dump b/runtime/syntax/testdir/dumps/vim_variables_05.dump
new file mode 100644
index 0000000..7a93260
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diff --git a/runtime/syntax/testdir/dumps/vim_variables_06.dump b/runtime/syntax/testdir/dumps/vim_variables_06.dump
new file mode 100644
index 0000000..89b3d41
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_variables_06.dump
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diff --git a/runtime/syntax/testdir/dumps/vim_variables_07.dump b/runtime/syntax/testdir/dumps/vim_variables_07.dump
new file mode 100644
index 0000000..8be0fa8
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+|.+0#e000002&@2| +0#0000000&@71
+|E+0#e000e06&|N|D| +0#0000000&@71
+|c+0#af5f00255&|o|n|s|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |e|v|a|l| |t|r|i|m| |E|N|D| +0#0000000&@47
+|.+0#e000002&@2| +0#0000000&@71
+>E+0#e000e06&|N|D| +0#0000000&@71
+@75
+|c+0#af5f00255&|o|n|s|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&@65
+|c+0#af5f00255&|o|n|s|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|b|a|r| @61
+@75
+|"+0#0000e05&| |:|f|o|r| +0#0000000&@68
+@75
+|f|o|r| |f+0#00e0e07&|o@1| +0#0000000&|i+0#af5f00255&|n| +0#0000000&|e|x|p|r| @59
+|e+0#af5f00255&|n|d|f|o|r| +0#0000000&@68
+@75
+|f|o|r| |[|f+0#00e0e07&|o@1|,+0#0000000&| |b+0#00e0e07&|a|r|]+0#0000000&| |i+0#af5f00255&|n| +0#0000000&|e|x|p|r| @52
+|e+0#af5f00255&|n|d|f|o|r| +0#0000000&@68
+|~+0#4040ff13&| @73
+|~| @73
+| +0#0000000&@56|1|2|7|,|1| @8|B|o|t| 
diff --git a/runtime/syntax/testdir/dumps/vim_variables_99.dump b/runtime/syntax/testdir/dumps/vim_variables_99.dump
index 230c121..6f3e1c4 100644
--- a/runtime/syntax/testdir/dumps/vim_variables_99.dump
+++ b/runtime/syntax/testdir/dumps/vim_variables_99.dump
@@ -1,20 +1,20 @@
-|"+0#0000e05#ffffff0| |V|i|m| |v|a|r|i|a|b|l|e| |h|i|g|h|l|i|g|h|t|i|n|g| +0#0000000&@47
+|.+0#e000002#ffffff0@2| +0#0000000&@71
+|E+0#e000e06&|N|D| +0#0000000&@71
+|c+0#af5f00255&|o|n|s|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |t|r|i|m| |e|v|a|l| |E|N|D| +0#0000000&@47
+|.+0#e000002&@2| +0#0000000&@71
+|E+0#e000e06&|N|D| +0#0000000&@71
+|c+0#af5f00255&|o|n|s|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |e|v|a|l| |t|r|i|m| |E|N|D| +0#0000000&@47
+|.+0#e000002&@2| +0#0000000&@71
+|E+0#e000e06&|N|D| +0#0000000&@71
 @75
-|l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#af5f00255&| +0#0000000&|e|x|p|r| @60
+|c+0#af5f00255&|o|n|s|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&@65
+|c+0#af5f00255&|o|n|s|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|b|a|r| @61
 @75
-|l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|++0#af5f00255&|=| +0#0000000&|e|x|p|r| @59
-|l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|-+0#af5f00255&|=| +0#0000000&|e|x|p|r| @59
-|l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|*+0#af5f00255&|=| +0#0000000&|e|x|p|r| @59
-|l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|/+0#af5f00255&|=| +0#0000000&|e|x|p|r| @59
-|l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|%+0#af5f00255&|=| +0#0000000&|e|x|p|r| @59
-|l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|.+0#af5f00255&|=| +0#0000000&|e|x|p|r| @59
->l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|.+0#af5f00255&@1|=| +0#0000000&|e|x|p|r| @58
-|~+0#4040ff13&| @73
-|~| @73
-|~| @73
-|~| @73
-|~| @73
-|~| @73
-|~| @73
-|~| @73
-|"+0#0000000&|i|n|p|u|t|/|v|i|m|_|v|a|r|i|a|b|l|e|s|.|v|i|m|"| |1@1|L|,| |1|5|8|B| @21|1@1|,|1| @9|A|l@1| 
+|"+0#0000e05&| |:|f|o|r| +0#0000000&@68
+@75
+|f|o|r| |f+0#00e0e07&|o@1| +0#0000000&|i+0#af5f00255&|n| +0#0000000&|e|x|p|r| @59
+|e+0#af5f00255&|n|d|f|o|r| +0#0000000&@68
+@75
+|f|o|r| |[|f+0#00e0e07&|o@1|,+0#0000000&| |b+0#00e0e07&|a|r|]+0#0000000&| |i+0#af5f00255&|n| +0#0000000&|e|x|p|r| @52
+>e+0#af5f00255&|n|d|f|o|r| +0#0000000&@68
+@57|1|3|8|,|1| @8|B|o|t| 
diff --git a/runtime/syntax/testdir/input/vim_variables.vim b/runtime/syntax/testdir/input/vim_variables.vim
index 93ad6d9..6f77da9 100644
--- a/runtime/syntax/testdir/input/vim_variables.vim
+++ b/runtime/syntax/testdir/input/vim_variables.vim
@@ -1,7 +1,16 @@
 " Vim variable highlighting
 
+" :let
+
 let foo = expr
 
+let foo[0] = expr
+
+let foo[1:2] = expr
+let foo[:2] = expr
+let foo[1:] = expr
+let foo[:] = expr
+
 let foo += expr
 let foo -= expr
 let foo *= expr
@@ -9,3 +18,121 @@
 let foo %= expr
 let foo .= expr
 let foo ..= expr
+
+let $FOO = expr
+let $FOO .= expr
+
+let @f = expr
+let @f .= expr
+
+let &foo = expr
+
+let &t_k1 = "\<Esc>[234;"
+
+let &foo .= expr
+
+let &foo += expr
+let &foo -= expr
+
+let &l:foo = expr
+
+let &l:foo .= expr
+let &l:foo += expr
+let &l:foo -= expr
+
+let &g:foo = expr
+
+let &g:foo .= expr
+let &g:foo += expr
+let &g:foo -= expr
+
+let [foo, bar] = expr
+let [foo,
+      \ bar] = expr
+
+let [foo, bar] .= expr
+let [foo, bar] += expr
+let [foo, bar] -= expr
+
+let [foo, bar; baz] = expr
+let [foo,
+      \ bar;
+      \ baz] = expr
+
+let [foo, bar; baz] .= expr
+let [foo, bar; baz] += expr
+let [foo, bar; baz] -= expr
+
+let foo =<< END
+...
+END
+let foo =<< trim END
+...
+END
+let foo =<< eval END
+...
+END
+let foo =<< trim eval END
+...
+END
+let foo =<< eval trim END
+...
+END
+
+let foo
+let foo bar
+
+" :unlet
+
+unlet foo
+unlet foo bar
+unlet foo
+      \ bar
+
+unlet! foo
+unlet! foo bar
+unlet! foo
+      \ bar
+
+unlet $FOO
+unlet! $FOO
+
+unlet list[3]
+unlet list[3:]
+unlet dict['two']
+unlet dict.two
+
+" :const
+
+const foo = expr
+
+const [foo, bar] = expr
+
+const [foo, bar; baz] = expr
+
+const foo =<< END
+...
+END
+const foo =<< trim END
+...
+END
+const foo =<< eval END
+...
+END
+const foo =<< trim eval END
+...
+END
+const foo =<< eval trim END
+...
+END
+
+const foo
+const foo bar
+
+" :for
+
+for foo in expr
+endfor
+
+for [foo, bar] in expr
+endfor
diff --git a/runtime/syntax/vim.vim b/runtime/syntax/vim.vim
index 5eb3154..5697ce3 100644
--- a/runtime/syntax/vim.vim
+++ b/runtime/syntax/vim.vim
@@ -4,7 +4,8 @@
 " Last Change:	May 09, 2023
 " 	2023 Nov 12 by Vim Project (:let-heredoc improvements)
 " 	2023 Nov 20 by Vim Project (:loadkeymap improvements)
-" 	2023 Dec 06 by Vim Project (add missing :let{op}= assignment operators)
+" 	2023 Dec 06 by Vim Project (add missing assignment operators)
+" 	2023 Dec 10 by Vim Project (improve variable matching)
 " Version:	9.0-25
 " URL:	http://www.drchip.org/astronaut/vim/index.html#SYNTAX_VIM
 " Automatically generated keyword lists: {{{1
@@ -187,7 +188,9 @@
 syn match vimIsCommand	"\<\h\w*\>"	contains=vimCommand
 syn match vimVar	      contained	"\<\h[a-zA-Z0-9#_]*\>"
 syn match vimVar		"\<[bwglstav]:\h[a-zA-Z0-9#_]*\>"
-syn match vimVar	      	"\s\zs&\a\+\>"
+syn match vimVar	      	"\s\zs&\%([lg]:\)\=\a\+\>"
+syn match vimVar		"\s\zs&t_\S[a-zA-Z0-9]\>"
+syn match vimVar        	"\s\zs&t_k;"
 syn match vimFBVar      contained   "\<[bwglstav]:\h[a-zA-Z0-9#_]*\>"
 syn keyword vimCommand  contained	in
 
@@ -395,6 +398,7 @@
 syn match	vimRegister	'\<normal\s\+\zs"[a-zA-Z0-9]'
 syn match	vimRegister	'@"'
 syn match	vimPlainRegister contained	'"[a-zA-Z0-9\-:.%#*+=]'
+syn match	vimLetRegister	contained	'@["0-9\-a-zA-Z#=*+_/]'
 
 syn match	vimAddress	",\zs[.$]"	skipwhite nextgroup=vimSubst1
 syn match	vimAddress	"%\ze\a"	skipwhite nextgroup=vimString,vimSubst1
@@ -417,10 +421,20 @@
 
 " Let And Var: {{{2
 " ===========
-syn keyword	vimLet	let	unl[et]	skipwhite nextgroup=vimVar,vimFuncVar,vimLetHereDoc
+syn keyword	vimLet	let		skipwhite nextgroup=vimVar,vimFuncVar,vimLetHereDoc,vimLetRegister,vimVarList
+syn keyword	vimConst	cons[t]		skipwhite nextgroup=vimVar,vimLetHereDoc,vimVarList
+syn region	vimVarList	contained	start="\[" end="]" contains=vimVar,vimContinue
+
+syn keyword	vimUnlet	unl[et]		skipwhite nextgroup=vimUnletBang,vimUnletVars
+syn match	vimUnletBang	contained	"!"	skipwhite nextgroup=vimUnletVars
+syn region	vimUnletVars	contained	start="$\I\|\h" skip="\n\s*\\" end="$" end="|" contains=vimVar,vimEnvvar,vimContinue,vimString,vimNumber
+
 VimFoldh syn region vimLetHereDoc	matchgroup=vimLetHereDocStart start='=<<\s*\%(trim\s\+\%(eval\s\+\)\=\|eval\s\+\%(trim\s\+\)\=\)\=\z(\L\S*\)' matchgroup=vimLetHereDocStop end='^\s*\z1\s*$'
 syn keyword	vimLet	var		skipwhite nextgroup=vimVar,vimFuncVar,vimLetHereDoc
 
+" For: {{{2
+" ===
+syn keyword	vimFor	for	skipwhite nextgroup=vimVar,vimVarList
 " Abbreviations: {{{2
 " =============
 syn keyword vimAbb	ab[breviate] ca[bbrev] inorea[bbrev] cnorea[bbrev] norea[bbrev] ia[bbrev] skipwhite nextgroup=vimMapMod,vimMapLhs
@@ -909,6 +923,7 @@
  hi def link vimCommentString	vimString
  hi def link vimCommentTitle	PreProc
  hi def link vimCondHL	vimCommand
+ hi def link vimConst	vimCommand
  hi def link vimContinue	Special
  hi def link vimCtrlChar	SpecialChar
  hi def link vimEchoHLNone	vimGroup
@@ -959,6 +974,7 @@
  hi def link vimLetHereDoc	vimString
  hi def link vimLetHereDocStart	Special
  hi def link vimLetHereDocStop	Special
+ hi def link vimLetRegister	Special
  hi def link vimLineComment	vimComment
  hi def link vim9LineComment	vimComment
  hi def link vimMapBang	vimCommand
@@ -1035,6 +1051,8 @@
  hi def link vimSynType	vimSpecial
  hi def link vimTodo	Todo
  hi def link vimType	Type
+ hi def link vimUnlet	vimCommand
+ hi def link vimUnletBang	vimCommand
  hi def link vimUnmap	vimMap
  hi def link vimUserAttrbCmpltFunc	Special
  hi def link vimUserAttrbCmplt	vimSpecial