diff --git a/public/assets/js/functions.js b/public/assets/js/functions.js
index aa03134..b8120e2 100644
--- a/public/assets/js/functions.js
+++ b/public/assets/js/functions.js
@@ -109,12 +109,12 @@ function sortBy(column) {
         for (let i = 1; i < (rows.length - 2); i++) {
             let x = rows[i]
             let rowXId = x.id
-            let rowXNumber = rowXId.charAt(rowXId.length -1)
+            let rowXNumber = rowXId.match(/\d+/)
             let valueX = document.getElementById(column + '_' + rowXNumber).value
 
             let y = rows[i + 1]
             let rowYId = y.id
-            let rowYNumber = rowYId.charAt(rowYId.length -1)
+            let rowYNumber = rowYId.match(/\d+/)
             let valueY = document.getElementById(column + '_' + rowYNumber).value
 
             let currentSortOrder = document.getElementById(column + '_sort')