diff --git a/GameFrameX.Foundation.Extensions/StringExtensions.cs b/GameFrameX.Foundation.Extensions/StringExtensions.cs
index ec4fefa..7f92bed 100644
--- a/GameFrameX.Foundation.Extensions/StringExtensions.cs
+++ b/GameFrameX.Foundation.Extensions/StringExtensions.cs
@@ -146,7 +146,7 @@ public static string FromUrlSafeBase64(this string value, bool addPadding)
     /// Regex for matching Chinese characters.
     /// Matching range includes basic Chinese characters (0x4e00-0x9fa5), excluding rare characters, variant characters, and other extended Chinese characters.
     /// </remarks>
-    private static readonly Regex CnReg = new(@"[\u4e00-\u9fa5]");
+    private static readonly Regex CnReg = new(@"[\u4e00-\u9fa5]", RegexOptions.None, TimeSpan.FromSeconds(1));
 
     /// <summary>
     /// 计算字符串的显示宽度，汉字等宽字符算作 2 个单位宽度，其他字符算作 1 个单位宽度。
diff --git a/GameFrameX.Foundation.Tests/Extensions/StringExtensionsTests.cs b/GameFrameX.Foundation.Tests/Extensions/StringExtensionsTests.cs
index 10a5ffc..9e920e6 100644
--- a/GameFrameX.Foundation.Tests/Extensions/StringExtensionsTests.cs
+++ b/GameFrameX.Foundation.Tests/Extensions/StringExtensionsTests.cs
@@ -745,6 +745,21 @@ public void TrimZhCn_StringWithoutChineseChars_ShouldReturnOriginalString()
         Assert.Equal("Hello World", result);
     }
 
+    [Fact]
+    public void TrimZhCn_CnReg_ShouldHaveOneSecondMatchTimeout()
+    {
+        // Arrange — 反射读取 CnReg 私有静态字段，验证 Sonar S6444 fix 实际生效。
+        var field = typeof(StringExtensions).GetField("CnReg", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Static);
+        Assert.NotNull(field);
+
+        // Act
+        var regex = (Regex)field.GetValue(null);
+
+        // Assert
+        Assert.NotNull(regex);
+        Assert.Equal(TimeSpan.FromSeconds(1), regex.MatchTimeout);
+    }
+
     #endregion
 
     #region EqualsFast Tests