diff --git a/runtime/syntax/testdir/dumps/vim_expr_00.dump b/runtime/syntax/testdir/dumps/vim_expr_00.dump
index 6330599..91ae939 100644
--- a/runtime/syntax/testdir/dumps/vim_expr_00.dump
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diff --git a/runtime/syntax/testdir/dumps/vim_expr_01.dump b/runtime/syntax/testdir/dumps/vim_expr_01.dump
new file mode 100644
index 0000000..5f9b02e
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_expr_01.dump
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new file mode 100644
index 0000000..67f229d
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new file mode 100644
index 0000000..23077c5
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diff --git a/runtime/syntax/testdir/dumps/vim_expr_99.dump b/runtime/syntax/testdir/dumps/vim_expr_99.dump
index 10447b8..4bcf10a 100644
--- a/runtime/syntax/testdir/dumps/vim_expr_99.dump
+++ b/runtime/syntax/testdir/dumps/vim_expr_99.dump
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new file mode 100644
index 0000000..8b77cf3
--- /dev/null
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
index 0000000..7337575
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_key_notation_08.dump
@@ -0,0 +1,20 @@
+|<+0#e000e06#ffffff0|D|r|o|p|>| +0#0000000&@68
+|<+0#e000e06&|N|u|l|>| +0#0000000&@69
+|<+0#e000e06&|S|N|R|>| +0#0000000&@69
+|<+0#e000e06&|P|l|u|g|>| +0#0000000&@68
+|<+0#e000e06&|C|u|r|s|o|r|H|o|l|d|>| +0#0000000&@62
+><+0#e000e06&|I|g|n|o|r|e|>| +0#0000000&@66
+|<+0#e000e06&|C|m|d|>| +0#0000000&@69
+|<+0#e000e06&|S|c|r|i|p|t|C|m|d|>| +0#0000000&@63
+|<+0#e000e06&|F|o|c|u|s|G|a|i|n|e|d|>| +0#0000000&@61
+|<+0#e000e06&|F|o|c|u|s|L|o|s|t|>| +0#0000000&@63
+@75
+|<+0#e000e06&|c|w|o|r|d|>| +0#0000000&@67
+|<+0#e000e06&|c|W|O|R|D|>| +0#0000000&@67
+|<+0#e000e06&|c|e|x|p|r|>| +0#0000000&@67
+|<+0#e000e06&|c|f|i|l|e|>| +0#0000000&@67
+|<+0#e000e06&|a|f|i|l|e|>| +0#0000000&@67
+|<+0#e000e06&|a|b|u|f|>| +0#0000000&@68
+|<+0#e000e06&|a|m|a|t|c|h|>| +0#0000000&@66
+|<+0#e000e06&|s|f|i|l|e|>| +0#0000000&@67
+@57|1|4|5|,|1| @8|9|6|%| 
diff --git a/runtime/syntax/testdir/dumps/vim_key_notation_99.dump b/runtime/syntax/testdir/dumps/vim_key_notation_99.dump
new file mode 100644
index 0000000..67dac5f
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_key_notation_99.dump
@@ -0,0 +1,20 @@
+|<+0#e000e06#ffffff0|I|g|n|o|r|e|>| +0#0000000&@66
+|<+0#e000e06&|C|m|d|>| +0#0000000&@69
+|<+0#e000e06&|S|c|r|i|p|t|C|m|d|>| +0#0000000&@63
+|<+0#e000e06&|F|o|c|u|s|G|a|i|n|e|d|>| +0#0000000&@61
+|<+0#e000e06&|F|o|c|u|s|L|o|s|t|>| +0#0000000&@63
+@75
+|<+0#e000e06&|c|w|o|r|d|>| +0#0000000&@67
+|<+0#e000e06&|c|W|O|R|D|>| +0#0000000&@67
+|<+0#e000e06&|c|e|x|p|r|>| +0#0000000&@67
+|<+0#e000e06&|c|f|i|l|e|>| +0#0000000&@67
+|<+0#e000e06&|a|f|i|l|e|>| +0#0000000&@67
+|<+0#e000e06&|a|b|u|f|>| +0#0000000&@68
+|<+0#e000e06&|a|m|a|t|c|h|>| +0#0000000&@66
+|<+0#e000e06&|s|f|i|l|e|>| +0#0000000&@67
+|<+0#e000e06&|s|t|a|c|k|>| +0#0000000&@67
+|<+0#e000e06&|s|c|r|i|p|t|>| +0#0000000&@66
+|<+0#e000e06&|s|l|n|u|m|>| +0#0000000&@67
+|<+0#e000e06&|s|f|l|n|u|m|>| +0#0000000&@66
+><+0#e000e06&|c|l|i|e|n|t|>| +0#0000000&@66
+@57|1|6|3|,|1| @8|B|o|t| 
diff --git a/runtime/syntax/testdir/dumps/vim_variables_01.dump b/runtime/syntax/testdir/dumps/vim_variables_01.dump
index f1ce29d..02f6819 100644
--- a/runtime/syntax/testdir/dumps/vim_variables_01.dump
+++ b/runtime/syntax/testdir/dumps/vim_variables_01.dump
@@ -14,7 +14,7 @@
 @75
 |l+0#af5f00255&|e|t| +0#0000000&|&+0#00e0e07&|f|o@1| +0#0000000&|=+0#af5f00255&| +0#0000000&|e|x|p|r| @59
 @75
-|l+0#af5f00255&|e|t| +0#0000000&|&+0#00e0e07&|t|_|k|1| +0#0000000&|=+0#af5f00255&| +0#0000000&|"+0#e000002&|\+0#e000e06&|<|E+0#e000002&|s|c|>|[|2|3|4|;|"| +0#0000000&@49
+|l+0#af5f00255&|e|t| +0#0000000&|&+0#00e0e07&|t|_|k|1| +0#0000000&|=+0#af5f00255&| +0#0000000&|"+0#e000002&|\+0#e000e06&|<|E|s|c|>|[+0#e000002&|2|3|4|;|"| +0#0000000&@49
 @75
 |l+0#af5f00255&|e|t| +0#0000000&|&+0#00e0e07&|f|o@1| +0#0000000&|.+0#af5f00255&|=| +0#0000000&|e|x|p|r| @58
 @57|1|9|,|1| @9|1|0|%| 
diff --git a/runtime/syntax/testdir/input/vim_expr.vim b/runtime/syntax/testdir/input/vim_expr.vim
index 0547e9b..be2cb2c 100644
--- a/runtime/syntax/testdir/input/vim_expr.vim
+++ b/runtime/syntax/testdir/input/vim_expr.vim
@@ -4,6 +4,23 @@
 echo 'tab: \t, new line: \n, backslash: \\'
 echo "tab: \t, new line: \n, backslash: \\"
 
+" String escape sequences
+
+echo "\316 - \31 - \3 - \x1f - \xf - \X1F - \XF - \u02a4 - \U000002a4 - \b - \e - \f - \n - \r - \t - \\ - \" - \<C-W>"
+echo '\316 \31 \3 \x1f \xf \X1F \XF \u02a4 \U000002a4 \b \e \f \n \r \t \\ \" \<C-W>'
+echo "\3160 - \x1f0 - \X1F0 - \u02a40 - \U000002a40"
+
+echo $"\316 - \31 - \3 - \x1f - \xf - \X1F - \XF - \u02a4 - \U000002a4 - \b - \e - \f - \n - \r - \t - \\ - \" - \<C-W>"
+echo $'\316 \31 \3 \x1f \xf \X1F \XF \u02a4 \U000002a4 \b \e \f \n \r \t \\ \" \<C-W>'
+echo $"\3160 - \x1f0 - \X1F0 - \u02a40 - \U000002a40"
+
+echo "\<C-a>"
+echo "\<*C-a>"
+echo "\<C->>"
+echo "\<*C->>"
+echo "\<C->>>"
+echo "\<*C->>>"
+
 " String interpolation
 
 echo 'Don''t highlight interpolation: {{ {1 + 2} }}'
@@ -12,3 +29,4 @@
 echo $'Highlight interpolation:\t{{ { $'nested: {{ {1 + 2} }}' } }}'
 echo $"Highlight interpolation:\t{{ { string({"foo": "bar"}) } }}"
 echo $"Highlight interpolation:\t{{ { $"nested: {{ {1 + 2} }}" } }}"
+
diff --git a/runtime/syntax/testdir/input/vim_key_notation.vim b/runtime/syntax/testdir/input/vim_key_notation.vim
new file mode 100644
index 0000000..8bc128a
--- /dev/null
+++ b/runtime/syntax/testdir/input/vim_key_notation.vim
@@ -0,0 +1,163 @@
+" Key notation
+ 
+<Space>
+<Tab>
+<Tab>
+<NL>
+<NewLine>
+<LineFeed>
+<LF>
+<CR>
+<Return>
+<Enter>
+<BS>
+<BackSpace>
+<Esc>
+<CSI>
+<xCSI>
+<Bar>
+<Bslash>
+<Del>
+<Delete>
+<kDel>
+<Up>
+<Down>
+<Left>
+<Right>
+<xUp>
+<xDown>
+<xLeft>
+<xRight>
+<PasteStart>
+<PasteEnd>
+<F1>
+<F2>
+<F3>
+<F4>
+<F5>
+<F6>
+<F7>
+<F8>
+<F9>
+<F10>
+<F11>
+<F12>
+<F13>
+<F14>
+<F15>
+<F16>
+<F17>
+<F18>
+<F19>
+<F20>
+<F21>
+<F22>
+<F23>
+<F24>
+<F25>
+<F26>
+<F27>
+<F28>
+<F29>
+<F30>
+<F31>
+<F32>
+<F33>
+<F34>
+<F35>
+<F36>
+<F37>
+<xF1>
+<xF2>
+<xF3>
+<xF4>
+<Help>
+<Undo>
+<Insert>
+<Ins>
+<kInsert>
+<Home>
+<kHome>
+<xHome>
+<zHome>
+<End>
+<kEnd>
+<xEnd>
+<zEnd>
+<PageUp>
+<PageDown>
+<kPageUp>
+<kPageDown>
+<kPlus>
+<kMinus>
+<kDivide>
+<kMultiply>
+<kEnter>
+<kPoint>
+<k0>
+<k1>
+<k2>
+<k3>
+<k4>
+<k5>
+<k6>
+<k7>
+<k8>
+<k9>
+<lt>
+<Mouse>
+<NetMouse>
+<DecMouse>
+<JsbMouse>
+<PtermMouse>
+<UrxvtMouse>
+<SgrMouse>
+<SgrMouseRelease>
+<LeftMouse>
+<LeftMouseNM>
+<LeftDrag>
+<LeftRelease>
+<LeftReleaseNM>
+<MouseMove>
+<MiddleMouse>
+<MiddleDrag>
+<MiddleRelease>
+<RightMouse>
+<RightDrag>
+<RightRelease>
+<ScrollWheelUp>
+<ScrollWheelDown>
+<ScrollWheelRight>
+<ScrollWheelLeft>
+<MouseDown>
+<MouseUp>
+<X1Mouse>
+<X1Drag>
+<X1Release>
+<X2Mouse>
+<X2Drag>
+<X2Release>
+<Drop>
+<Nul>
+<SNR>
+<Plug>
+<CursorHold>
+<Ignore>
+<Cmd>
+<ScriptCmd>
+<FocusGained>
+<FocusLost>
+
+<cword>
+<cWORD>
+<cexpr>
+<cfile>
+<afile>
+<abuf>
+<amatch>
+<sfile>
+<stack>
+<script>
+<slnum>
+<sflnum>
+<client>
diff --git a/runtime/syntax/vim.vim b/runtime/syntax/vim.vim
index 4627f3d..2179953 100644
--- a/runtime/syntax/vim.vim
+++ b/runtime/syntax/vim.vim
@@ -14,6 +14,7 @@
 " 	2024 Jan 25 by Vim Project (WinNewPre autocommand)
 " 	2024 Jan 27 by Vim Project (add foreach() function)
 " 	2024 Jan 28 by Vim Project (improve line-continuation matching & string interpolation)
+" 	2024 Feb 01 by Vim Project (improve special key matching)
 " Version:	9.0-25
 " URL:	http://www.drchip.org/astronaut/vim/index.html#SYNTAX_VIM
 " Automatically generated keyword lists: {{{1
@@ -369,6 +370,10 @@
 syn match	vimString	contained	+"[^"]*\\$+	skipnl nextgroup=vimStringCont
 syn match	vimStringCont	contained	+\(\\\\\|.\)\{-}[^\\]"+
 syn match	vimEscape	contained	"\\."
+" syn match	vimEscape	contained	+\\[befnrt\"]+
+syn match	vimEscape	contained	"\\\o\{1,3}\|\\[xX]\x\{1,2}\|\\u\x\{1,4}\|\\U\x\{1,8}"
+syn match	vimEscape	contained	"\\<" contains=vimNotation
+syn match	vimEscape	contained	"\\<\*[^>]*>\=>"
 
 syn region	vimString start=+$'+ end=+'+ skip=+''+ oneline contains=vimStringInterpolationBrace,vimStringInterpolationExpr
 syn region	vimString start=+$"+ end=+"+ oneline contains=@vimStringGroup,vimStringInterpolationBrace,vimStringInterpolationExpr
@@ -504,13 +509,23 @@
 " Angle-Bracket Notation: (tnx to Michael Geddes) {{{2
 " ======================
 syn case ignore
-syn match	vimNotation	"\%#=1\(\\\|<lt>\)\=<\([scamd]-\)\{0,4}x\=\(f\d\{1,2}\|[^ \t:]\|cmd\|scriptcmd\|cr\|lf\|linefeed\|retu\%[rn]\|k\=del\%[ete]\|bs\|backspace\|tab\|esc\|right\|left\|help\|undo\|insert\|ins\|mouse\|k\=home\|k\=end\|kplus\|kminus\|kdivide\|kmultiply\|kenter\|kpoint\|space\|k\=\(page\)\=\(\|down\|up\|k\d\>\)\)>" contains=vimBracket
-syn match	vimNotation	"\%#=1\(\\\|<lt>\)\=<\([scam2-4]-\)\{0,4}\(right\|left\|middle\)\(mouse\)\=\(drag\|release\)\=>"	contains=vimBracket
-syn match	vimNotation	"\%#=1\(\\\|<lt>\)\=<\(bslash\|plug\|sid\|space\|bar\|nop\|nul\|lt\)>"			contains=vimBracket
-syn match	vimNotation	'\(\\\|<lt>\)\=<C-R>[0-9a-z"%#:.\-=]'he=e-1				contains=vimBracket
-syn match	vimNotation	'\%#=1\(\\\|<lt>\)\=<\%(q-\)\=\(line[12]\|count\|bang\|reg\|args\|mods\|f-args\|f-mods\|lt\)>'	contains=vimBracket
-syn match	vimNotation	"\%#=1\(\\\|<lt>\)\=<\([cas]file\|abuf\|amatch\|cword\|cWORD\|client\)>"		contains=vimBracket
-syn match	vimNotation	"\%#=1\(\\\|<lt>\)\=<\%([scamd]-\)\{0,4}char-\%(\d\+\|0\o\+\|0x\x\+\)>"			contains=vimBracket
+syn match	vimNotation	"\%#=1\%(\\\|<lt>\)\=<\%([scamd]-\)\{0,4}x\=\%(f\d\{1,2}\|[^ \t:]\|space\|bar\|bslash\|nl\|newline\|lf\|linefeed\|cr\|retu\%[rn]\|enter\|k\=del\%[ete]\|bs\|backspace\|tab\|esc\|csi\|right\|paste\%(start\|end\)\|left\|help\|undo\|k\=insert\|ins\|mouse\|[kz]\=home\|[kz]\=end\|kplus\|kminus\|kdivide\|kmultiply\|kenter\|kpoint\|space\|k\=\%(page\)\=\%(\|down\|up\|k\d\>\)\)>" contains=vimBracket
+
+syn match	vimNotation	"\%#=1\%(\\\|<lt>\)\=<\%([scamd2-4]-\)\{0,4}\%(net\|dec\|jsb\|pterm\|urxvt\|sgr\)mouse>"		contains=vimBracket
+syn match	vimNotation	"\%#=1\%(\\\|<lt>\)\=<\%([scamd2-4]-\)\{0,4}\%(left\|middle\|right\)\%(mouse\|drag\|release\)>"	contains=vimBracket
+syn match	vimNotation	"\%#=1\%(\\\|<lt>\)\=<\%([scamd2-4]-\)\{0,4}left\%(mouse\|release\)nm>"			contains=vimBracket
+syn match	vimNotation	"\%#=1\%(\\\|<lt>\)\=<\%([scamd2-4]-\)\{0,4}x[12]\%(mouse\|drag\|release\)>"		contains=vimBracket
+syn match	vimNotation	"\%#=1\%(\\\|<lt>\)\=<\%([scamd2-4]-\)\{0,4}sgrmouserelease>"			contains=vimBracket
+syn match	vimNotation	"\%#=1\%(\\\|<lt>\)\=<\%([scamd2-4]-\)\{0,4}mouse\%(up\|down\|move\)>"			contains=vimBracket
+syn match	vimNotation	"\%#=1\%(\\\|<lt>\)\=<\%([scamd2-4]-\)\{0,4}scrollwheel\%(up\|down\|right\|left\)>"		contains=vimBracket
+
+syn match	vimNotation	"\%#=1\%(\\\|<lt>\)\=<\%(sid\|nop\|nul\|lt\|drop\)>"				contains=vimBracket
+syn match	vimNotation	"\%#=1\%(\\\|<lt>\)\=<\%(snr\|plug\|cursorhold\|ignore\|cmd\|scriptcmd\|focus\%(gained\|lost\)\)>"	contains=vimBracket
+syn match	vimNotation	'\%(\\\|<lt>\)\=<C-R>[0-9a-z"%#:.\-=]'he=e-1				contains=vimBracket
+syn match	vimNotation	'\%#=1\%(\\\|<lt>\)\=<\%(q-\)\=\%(line[12]\|count\|bang\|reg\|args\|mods\|f-args\|f-mods\|lt\)>'	contains=vimBracket
+syn match	vimNotation	"\%#=1\%(\\\|<lt>\)\=<\%([cas]file\|abuf\|amatch\|cexpr\|cword\|cWORD\|client\|stack\|script\|sf\=lnum\)>"	contains=vimBracket
+syn match	vimNotation	"\%#=1\%(\\\|<lt>\)\=<\%([scamd]-\)\{0,4}char-\%(\d\+\|0\o\+\|0x\x\+\)>"		contains=vimBracket
+
 syn match	vimBracket contained	"[\\<>]"
 syn case match