diff --git a/system/Helpers/array_helper.php b/system/Helpers/array_helper.php
index 423f9c266dd5..2f8a5f9c8366 100644
--- a/system/Helpers/array_helper.php
+++ b/system/Helpers/array_helper.php
@@ -20,7 +20,13 @@
      */
     function dot_array_search(string $index, array $array)
     {
-        $segments = preg_split('/(?<!\\\)\./', rtrim($index, '* '), 0, PREG_SPLIT_NO_EMPTY);
+        // See https://regex101.com/r/44Ipql/1
+        $segments = preg_split(
+            '/(?<!\\\\)\./',
+            rtrim($index, '* '),
+            0,
+            PREG_SPLIT_NO_EMPTY
+        );
 
         $segments = array_map(static function ($key) {
             return str_replace('\.', '.', $key);