Fix highlighting of dollar amount at start of line in md files

Fixes #136535

Author: mjbvz

extensions/markdown-math/syntaxes/md-math-block.tmLanguage.json

@@ -48,7 +48,7 @@
 		"single_dollar_math_block": {
 			"name": "markup.math.block.markdown",
 			"contentName": "meta.embedded.math.markdown",
-			"begin": "(?<=^\\s*)(\\${1})(?![^$]*\\${1})",
+			"begin": "(?<=^\\s*)(\\$)(?![^$]*\\$|\\d)",
 			"beginCaptures": {
 				"1": {
 					"name": "punctuation.definition.math.begin.markdown"

extensions/vscode-colorize-tests/test/colorize-fixtures/md-math.md

@@ -152,10 +152,18 @@ a **b**
     $$
     **b**
 
-<!-- Should allow inline code to be followed by non word character  #136584 -->
+<!-- Should allow inline code to be followed by non word character #136584 -->
 
 Should be highlighted $\frac{1}{2}$.
 
 Should not be highlighted $\frac{1}{2}$text
 
 Should not be highlighted $\frac{1}{2}$10
+
+<!-- Should not highlight dollar amount at start of line #136535 -->
+
+$12.45
+
+$12.45 x
+
+x $12.45

extensions/vscode-colorize-tests/test/colorize-results/md-math_md.json

@@ -6292,7 +6292,7 @@
 		}
 	},
 	{
-		"c": " Should allow inline code to be followed by non word character  #136584 ",
+		"c": " Should allow inline code to be followed by non word character #136584 ",
 		"t": "text.html.markdown comment.block.html",
 		"r": {
 			"dark_plus": "comment: #6A9955",
@@ -6466,5 +6466,71 @@
 			"light_vs": "default: #000000",
 			"hc_black": "default: #FFFFFF"
 		}
+	},
+	{
+		"c": "<!--",
+		"t": "text.html.markdown comment.block.html punctuation.definition.comment.html",
+		"r": {
+			"dark_plus": "comment: #6A9955",
+			"light_plus": "comment: #008000",
+			"dark_vs": "comment: #6A9955",
+			"light_vs": "comment: #008000",
+			"hc_black": "comment: #7CA668"
+		}
+	},
+	{
+		"c": " Should not highlight dollar amount at start of line #136535 ",
+		"t": "text.html.markdown comment.block.html",
+		"r": {
+			"dark_plus": "comment: #6A9955",
+			"light_plus": "comment: #008000",
+			"dark_vs": "comment: #6A9955",
+			"light_vs": "comment: #008000",
+			"hc_black": "comment: #7CA668"
+		}
+	},
+	{
+		"c": "-->",
+		"t": "text.html.markdown comment.block.html punctuation.definition.comment.html",
+		"r": {
+			"dark_plus": "comment: #6A9955",
+			"light_plus": "comment: #008000",
+			"dark_vs": "comment: #6A9955",
+			"light_vs": "comment: #008000",
+			"hc_black": "comment: #7CA668"
+		}
+	},
+	{
+		"c": "$12.45",
+		"t": "text.html.markdown meta.paragraph.markdown",
+		"r": {
+			"dark_plus": "default: #D4D4D4",
+			"light_plus": "default: #000000",
+			"dark_vs": "default: #D4D4D4",
+			"light_vs": "default: #000000",
+			"hc_black": "default: #FFFFFF"
+		}
+	},
+	{
+		"c": "$12.45 x",
+		"t": "text.html.markdown meta.paragraph.markdown",
+		"r": {
+			"dark_plus": "default: #D4D4D4",
+			"light_plus": "default: #000000",
+			"dark_vs": "default: #D4D4D4",
+			"light_vs": "default: #000000",
+			"hc_black": "default: #FFFFFF"
+		}
+	},
+	{
+		"c": "x $12.45",
+		"t": "text.html.markdown meta.paragraph.markdown",
+		"r": {
+			"dark_plus": "default: #D4D4D4",
+			"light_plus": "default: #000000",
+			"dark_vs": "default: #D4D4D4",
+			"light_vs": "default: #000000",
+			"hc_black": "default: #FFFFFF"
+		}
 	}
 ]