Change runtime identifier check to regex

Author: rzikm

src/libraries/Common/tests/System/Net/Capability.Security.Unix.cs

@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Runtime.InteropServices;
+using System.Text.RegularExpressions;
 
 namespace System.Net.Test.Common
 {
@@ -11,7 +12,7 @@ public static bool IsNtlmInstalled()
         {
             return
                 // Linux bionic uses managed NTLM implementation
-                OperatingSystem.IsLinux() && RuntimeInformation.RuntimeIdentifier.StartsWith("linux-bionic", StringComparison.OrdinalIgnoreCase) ||
+                OperatingSystem.IsLinux() && Regex.IsMatch(RuntimeInformation.RuntimeIdentifier, "^linux-bionic(-.*)?$", RegexOptions.CultureInvariant | RegexOptions.NonBacktracking | RegexOptions.ExplicitCapture) ||
                 // GSS on Linux does not work with OpenSSL 3.0. Fix was submitted to gss-ntlm but it will take a while to make to
                 // all supported distributions. The second part of the check should be removed when it does.
                 Interop.NetSecurityNative.IsNtlmInstalled() && (!PlatformDetection.IsOpenSslSupported || PlatformDetection.OpenSslVersion.Major < 3);

src/libraries/System.Net.Security/src/System.Net.Security.csproj

@@ -462,6 +462,7 @@
     <Reference Include="System.Security.Claims" />
     <Reference Include="System.Security.Cryptography" />
     <Reference Include="System.Security.Principal.Windows" />
+    <Reference Include="System.Text.RegularExpressions" />
     <Reference Include="System.Threading" />
     <Reference Include="System.Threading.ThreadPool" />
   </ItemGroup>

src/libraries/System.Net.Security/src/System/Net/NegotiateAuthenticationPal.Unix.cs

@@ -13,6 +13,7 @@
 using System.Security.Authentication.ExtendedProtection;
 using System.Security.Principal;
 using System.Text;
+using System.Text.RegularExpressions;
 using Microsoft.Win32.SafeHandles;
 
 namespace System.Net
@@ -25,7 +26,7 @@ internal partial class NegotiateAuthenticationPal
             AppContext.TryGetSwitch("System.Net.Security.UseManagedNtlm", out bool useManagedNtlm) ?
             useManagedNtlm :
             OperatingSystem.IsMacOS() || OperatingSystem.IsIOS() || OperatingSystem.IsMacCatalyst() ||
-            (OperatingSystem.IsLinux() && RuntimeInformation.RuntimeIdentifier.StartsWith("linux-bionic", StringComparison.OrdinalIgnoreCase));
+            (OperatingSystem.IsLinux() && Regex.IsMatch(RuntimeInformation.RuntimeIdentifier, "^linux-bionic(-.*)?$", RegexOptions.CultureInvariant | RegexOptions.NonBacktracking | RegexOptions.ExplicitCapture));
 
         public static NegotiateAuthenticationPal Create(NegotiateAuthenticationClientOptions clientOptions)
         {