adjustments to latex mode

lib/ace/mode/latex_highlight_rules.js

@@ -11,16 +11,18 @@ var LatexHighlightRules = function() {
             token : "keyword",
             regex : "\\\\(documentclass|usepackage|label)"
         },{
+            // Escaped character (including new line)
             token : "constant.character.escape",
-            regex : "\\\\{2}"
+            regex : "\\\\[^a-zA-Z]"
         },{
+            // A block
             token : "storage.type",
             regex : "\\\\(:?begin|end)",
             next  : "block"
         },{
             // A tex command e.g. \foo
             token : "storage.type",
-            regex : "\\\\(?:[^a-zA-Z]|[a-zA-Z]+)"
+            regex : "\\\\[a-zA-Z\\d]+"
         }, {
             // Curly and square braces
             token : "lparen",