javascript.js in codemirror-rails-4.13

- old
+ new

@@ -116,10 +116,10 @@
         stream.skipToEnd();
         return ret("comment", "comment");
       } else if (state.lastType == "operator" || state.lastType == "keyword c" ||
                state.lastType == "sof" || /^[\[{}\(,;:]$/.test(state.lastType)) {
         readRegexp(stream);
-        stream.eatWhile(/[gimy]/); // 'y' is "sticky" option in Mozilla
+        stream.match(/^\b(([gimyu])(?![gimyu]*\2))+\b/);
         return ret("regexp", "string-2");
       } else {
         stream.eatWhile(isOperatorChar);
         return ret("operator", "operator", stream.current());
       }