diff --git a/src/core/Utils.js b/src/core/Utils.js
index 3c3622fb..a72a319c 100755
--- a/src/core/Utils.js
+++ b/src/core/Utils.js
@@ -201,7 +201,7 @@ const Utils = {
      * Utils.parseEscapedChars("\\n");
      */
     parseEscapedChars: function(str) {
-        return str.replace(/(\\)?\\([nrtbf]|x[\da-f]{2})/g, function(m, a, b) {
+        return str.replace(/(\\)?\\([nrtbf]|x[\da-fA-F]{2})/g, function(m, a, b) {
             if (a === "\\") return "\\"+b;
             switch (b[0]) {
                 case "n":