diff --git a/framework/CHANGELOG.md b/framework/CHANGELOG.md
index 4869591ce6f..2cea02497bd 100644
--- a/framework/CHANGELOG.md
+++ b/framework/CHANGELOG.md
@@ -5,6 +5,7 @@ Yii Framework 2 Change Log
 ------------------------
 
 - Enh #20309: Add custom attributes support to style tags (nzwz)
+- Bug #20322: Correct escaping of hex ranges in Html::escapeJsRegularExpression (kowap)
 
 
 2.0.52 February 13, 2025
diff --git a/framework/helpers/BaseHtml.php b/framework/helpers/BaseHtml.php
index 3d7bc17d772..68a79f0e9cd 100644
--- a/framework/helpers/BaseHtml.php
+++ b/framework/helpers/BaseHtml.php
@@ -2392,7 +2392,7 @@ public static function getInputId($model, $attribute)
      */
     public static function escapeJsRegularExpression($regexp)
     {
-        $pattern = preg_replace('/\\\\x\{?([0-9a-fA-F]+)\}?/', '\u$1', $regexp);
+        $pattern = preg_replace('/\\\\x([0-9a-fA-F]{2})/', '\\x{$1}', $regexp);
         $deliminator = substr($pattern, 0, 1);
         $pos = strrpos($pattern, $deliminator, 1);
         $flag = substr($pattern, $pos + 1);
diff --git a/tests/framework/helpers/HtmlTest.php b/tests/framework/helpers/HtmlTest.php
index 5913cd55f03..08cad560a20 100644
--- a/tests/framework/helpers/HtmlTest.php
+++ b/tests/framework/helpers/HtmlTest.php
@@ -38,6 +38,29 @@ protected function setUp(): void
         ]);
     }
 
+    /**
+     * @covers \yii\helpers\Html::escapeJsRegularExpression
+     */
+    public function testEscapeJsRegularExpressionHexRange()
+    {
+        $testCases = [
+            '/^[\x00-\xFF]{8,72}$/',
+            '/^[\xA1-\xFE]{2}$/',
+            '/^\xFF\x00$/',
+        ];
+
+        $expectedResults = [
+            '/^[\x{00}-\x{FF}]{8,72}$/',
+            '/^[\x{A1}-\x{FE}]{2}$/',
+            '/^\x{FF}\x{00}$/',
+        ];
+
+        foreach ($testCases as $index => $original) {
+            $escaped = Html::escapeJsRegularExpression($original);
+            $this->assertSame($expectedResults[$index], $escaped, "Test case #$index failed.");
+        }
+    }
+
     public function testEncode()
     {
         $this->assertEquals('a&lt;&gt;&amp;&quot;&#039;�', Html::encode("a<>&\"'\x80"));