Added: New internals for format to use

src/_internals/_hasPlaceholder.js

@@ -0,0 +1,9 @@
+/**
+ * @private
+ * @function
+ * @param {String} str The string to check for placeholders
+ * @returns {Boolean} Whether or not the string has a placeholder
+ */
+export default function _hasPlaceholder (str) {
+  return str.includes('_')
+}

src/_internals/_uglifyFormats.js

@@ -0,0 +1,9 @@
+/**
+ * @private
+ * @function
+ * @param {String} str The string to strip special characters
+ * @returns {String} The newly created string with special characters stripped
+ */
+export default function _uglifyFormats (str) {
+  return str.replace(/[^a-wyz]/gi, '')
+}