diff --git a/src/_utils.js b/src/_utils.js
index 59c5a01..73da457 100644
--- a/src/_utils.js
+++ b/src/_utils.js
@@ -1,12 +1,15 @@
+/**
+ * @param {string} str
+ */
 export function _partsSpecial(str) {
-  const cleaned = str.replace(
-    /^[\s]*([CMEDGPNATFSHMORW]{1,5})[^A-Z0-9]*([0-9]{4})[\s]*$/i,
-    "$1,$2"
-  );
+  const cleaned = str.replace(/^[\s]*([CMEDGPNATFSHMORW]{1,5})[\W]*([0-9]{4})[\s]*$/i, "$1,$2");
 
   return cleaned.split(",");
 }
 
+/**
+ * @param {string} str
+ */
 export function _partsOld(str) {
   const cleaned = str.replace(
     /^[\s]*([A-Z]{1,3})[^A-Z0-9]*([0-9]{4})[^A-Z0-9]*([A-Z]{2})[\s]*$/i,
@@ -16,6 +19,9 @@ export function _partsOld(str) {
   return cleaned.split(",");
 }
 
+/**
+ * @param {string} str
+ */
 export function _partsNew(str) {
   const cleaned = str.replace(
     /^[\s]*([0-9]{4})[^A-Z0-9]*([BCDFGHJKLMNPRSTVWXYZ]{3})[\s]*$/i,