diff --git a/utilities/filter.js b/utilities/filter.js
index c0055f5..795947b 100644
--- a/utilities/filter.js
+++ b/utilities/filter.js
@@ -1,5 +1,5 @@
 function isBarcode(toFilter) {
-    const exp = /^A0A3B82[A-F0-9][A-F0-9][A-F0-9][A-F0-9][A-F0-9]$/;
+    const exp = /^A0A3B82[A-F0-9]{5}$/;
     return exp.test(toFilter);
 }
 let n = true;
@@ -9,7 +9,7 @@ function isShelving(toFilter) {
         toFilter = Array;
         toFilter[0] = s;
     }
-    const exp = /^[A-Z][A-Z][A-Z]$/;
+    const exp = /^[A-Z]{3}$/;
     for (let i = 0; i < toFilter.length; i++) {
         let state = exp.test(toFilter[i]);
         if (state == false)
@@ -20,6 +20,5 @@ function isShelving(toFilter) {
     else
         return true;
 }
-
 exports.isBarcode = isBarcode;
 exports.isShelving = isShelving;