diff --git a/src/Filters/Sprintf/language/de-AT/not_allowed.php b/src/Filters/Sprintf/language/de-AT/not_allowed.php
deleted file mode 100644
index cf72a96..0000000
--- a/src/Filters/Sprintf/language/de-AT/not_allowed.php
+++ /dev/null
@@ -1,10 +0,0 @@
-<?php
-
-return [
-        '%-ige' => [
-                'type' => 'exact'
-        ],
-        '%ige'  => [
-                'type' => 'exact'
-        ],
-];
\ No newline at end of file
diff --git a/src/Filters/Sprintf/language/de-CH/not_allowed.php b/src/Filters/Sprintf/language/de-CH/not_allowed.php
deleted file mode 100644
index cf72a96..0000000
--- a/src/Filters/Sprintf/language/de-CH/not_allowed.php
+++ /dev/null
@@ -1,10 +0,0 @@
-<?php
-
-return [
-        '%-ige' => [
-                'type' => 'exact'
-        ],
-        '%ige'  => [
-                'type' => 'exact'
-        ],
-];
\ No newline at end of file
diff --git a/src/Filters/Sprintf/language/de-DE/not_allowed.php b/src/Filters/Sprintf/language/de-DE/not_allowed.php
deleted file mode 100644
index cf72a96..0000000
--- a/src/Filters/Sprintf/language/de-DE/not_allowed.php
+++ /dev/null
@@ -1,10 +0,0 @@
-<?php
-
-return [
-        '%-ige' => [
-                'type' => 'exact'
-        ],
-        '%ige'  => [
-                'type' => 'exact'
-        ],
-];
\ No newline at end of file
diff --git a/src/Filters/SprintfToPH.php b/src/Filters/SprintfToPH.php
index d755881..df9a8b8 100644
--- a/src/Filters/SprintfToPH.php
+++ b/src/Filters/SprintfToPH.php
@@ -33,6 +33,12 @@ public function __construct() {
      * 20%-zar - ignored
      *</code>
      *
+     * @see
+     * - https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/Strings/Articles/formatSpecifiers.html#//apple_ref/doc/uid/TP40004265-SW1
+     * - https://en.cppreference.com/w/c/io/fprintf
+     * - https://www.php.net/manual/en/function.sprintf.php
+     * - https://www.w3resource.com/c-programming/stdio/c_library_method_sprintf.php
+     *
      * @param $segment
      *
      * @return string
@@ -45,7 +51,7 @@ public function transform( $segment ) {
         $segment = $sprintfLocker->lock( $segment );
 
         // Octal parsing is disabled due to Hungarian percentages 20%-os
-        $regex = '/(?:\x25\x25)|(\x25(?:(?:[1-9]\d*)\$|\((?:[^\)]+)\))?(?:\+)?(?:0|[+-]?\'[^$])?(?:-)?(?:\d+)?(?:\.(?:\d+))?((?:[hjlqtzL]{0,2}([ac-gopsuxAC-GOSUX]{1})|(\-[a-z]{1,3}))(?![\d\w])|(?:#@[\w]+@)|(?:@)))/';
+        $regex = '/(?:\x25\x25)|(\x25(?:(?:[1-9]\d*)\$|\((?:[^\)]+)\))?(?:\+)?(?:0|[+-]?\'[^$])?(?:-)?(?:\d+)?(?:\.(?:\d+))?((?:[hjlqtzL]{0,2}[ac-giopsuxAC-GOSUX]{1})(?![\d\w])|(?:#@[\w]+@)|(?:@)))/';
 
 
         preg_match_all( $regex, $segment, $vars, PREG_SET_ORDER );
diff --git a/tests/SprintfTest.php b/tests/SprintfTest.php
index 523f94f..8f932eb 100644
--- a/tests/SprintfTest.php
+++ b/tests/SprintfTest.php
@@ -96,14 +96,6 @@ private function runTests($notAllowed, $languageToTest)
 
             $this->assertEquals($segment, $segmentL1);
             $this->assertEquals($segment, $segmentL2);
-
-            $filter = MateCatFilter::getInstance( new FeatureSet(), 'en-US', 'it-IT' );
-
-            $segmentL1 = $filter->fromLayer0ToLayer1( $segment );
-            $segmentL2 = $filter->fromLayer0ToLayer2( $segment );
-
-            $this->assertNotEquals($segment, $segmentL1);
-            $this->assertNotEquals($segment, $segmentL2);
         }
     }
 }
\ No newline at end of file