https://groups.google.com/d/msg/ace-internals/Esa5o7DC0Go/X3LUZrMNL68J

lib/ace/mode/ruby_highlight_rules.js

@@ -140,31 +140,8 @@ RubyHighlightRules = function() {
 	            token : "comment", // comment spanning whole line
 	            regex : ".+"
 	        }
-        ],
-        "qqstring" : [
-            {
-	            token : "string",
-	            regex : '(?:(?:\\\\.)|(?:[^"\\\\]))*?"',
-	            next : "start"
-	        }, {
-	            token : "string",
-	            regex : '.+'
-	        }
-        ],
-        "qstring" : [
-	        {
-	            token : "string",
-	            regex : "(?:(?:\\\\.)|(?:[^'\\\\]))*?'",
-	            next : "start"
-	        }, {
-	            token : "string",
-	            regex : '.+'
-	        }
         ]
     };
-
-    this.addRules(docComment.getRules(), "doc-");
-    this.$rules["doc-start"][0].next = "start";
 };
 
 oop.inherits(RubyHighlightRules, TextHighlightRules);