add support for unicode regexes - closes #11

lib/6to5/transform.js

@@ -107,5 +107,6 @@ transform.transformers = {
   blockBinding:             require("./transformers/block-binding"),
   modules:                  require("./transformers/modules"),
   restParameters:           require("./transformers/rest-parameters"),
-  forOf:                    require("./transformers/for-of")
+  forOf:                    require("./transformers/for-of"),
+  unicodeRegex:             require("./transformers/unicode-regex")
 };

lib/6to5/transformers/unicode-regex.js

@@ -0,0 +1,15 @@
+var regexpu = require("regexpu");
+var b       = require("ast-types").builders;
+var _       = require("lodash");
+
+exports.Literal = function (node) {
+  var regex = node.regex;
+  if (!regex) return;
+
+  var flags = regex.flags.split("")
+  if (!_.contains(regex.flags, "u")) return;
+  _.pull(flags, "u");
+
+  var pattern = regexpu.rewritePattern(regex.pattern, regex.flags);
+  return b.literal(new RegExp(pattern, flags.join("")));
+};