Fix regex warning message

www/js/util.js

@@ -2160,13 +2160,13 @@ function checkEntitiesInStr(str) {
         ">": ">",
         '"': """,
         "'": "'",
-        "(": "(",
-        ")": ")"
+        "\\(": "(",
+        "\\)": ")"
     };
 
-    var m = str.match(/([&<>"'\(\)])/);
+    var m = str.match(/([&<>"'])|(\\\()|(\\\))/);
     if (m && m[1] in entities) {
-        return { src: m[1], replace: entities[m[1]] };
+        return { src: m[1].replace(/^\\/, ""), replace: entities[m[1]] };
     } else {
         return false;
     }