Fix highlighting of JavaScript regular expressions.

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Highlighting/Resources/JavaScript-Mode.xshd

@@ -6,6 +6,7 @@
 	<Color name="Comment" foreground="Green" />
 	<Color name="String" foreground="Sienna" />
 	<Color name="Character" foreground="Sienna" />
+	<Color name="Regex" foreground="Sienna" />
 	<Color name="JavaScriptKeyWords" foreground="Blue" />
 	<Color name="JavaScriptIntrinsics" foreground="Blue" />
 	<Color name="JavaScriptLiterals" foreground="Blue" />
@@ -104,6 +105,14 @@
 			<Begin>/\*</Begin>
 			<End>\*/</End>
 		</Span>
+		<!--<Rule color="Regex">/.*/</Rule>-->
+		<Span color="Regex">
+			<Begin>/</Begin>
+			<End>/</End>
+			<RuleSet>
+				<Span begin="\\/" end="." />
+			</RuleSet>
+		</Span>
 		<Span color="String" multiline="true">
 			<Begin>"</Begin>
 			<End>"</End>