Unblock Core build by fixing snippet error

eng/SnippetGenerator/DirectoryProcessor.cs

@@ -21,11 +21,11 @@ public class DirectoryProcessor
         private readonly Lazy<List<Snippet>> _snippets;
         private static readonly Regex _markdownOnlyRegex = new Regex(
             @"(?<indent>\s*)//@@\s*(?<line>.*)",
-            RegexOptions.Compiled | RegexOptions.Singleline);
+            RegexOptions.Compiled | RegexOptions.Singleline | RegexOptions.CultureInvariant);
         private const string _codeOnlyPattern = "/*@@*/";
         private static readonly Regex _regionRegex = new Regex(
             @"^(?<indent>\s*)(#region|#endregion)\s*(?<line>.*)",
-            RegexOptions.Compiled | RegexOptions.Singleline);
+            RegexOptions.Compiled | RegexOptions.Singleline | RegexOptions.CultureInvariant);
 
         private UTF8Encoding _utf8EncodingWithoutBOM;
 

eng/SnippetGenerator/Program.cs

@@ -1,7 +1,9 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
+using System;
 using System.IO;
+using System.Linq;
 using System.Threading.Tasks;
 using McMaster.Extensions.CommandLineUtils;
 using Microsoft.CodeAnalysis.Options;
@@ -20,20 +22,26 @@ public void OnExecuteAsync()
             var baseDirParent = Directory.GetParent(BasePath).Name;
             if (baseDirectory.Equals("sdk") || baseDirParent.Equals("sdk"))
             {
-                foreach (var sdkDir in Directory.GetDirectories(BasePath))
-                {
-                    new DirectoryProcessor(sdkDir).Process();
-                }
+                Parallel.ForEach(Directory.GetDirectories(BasePath), sdkDir => new DirectoryProcessor(sdkDir).Process());
             }
-            else 
+            else
             {
                 new DirectoryProcessor(BasePath).Process();
             }
         }
 
         public static int Main(string[] args)
         {
-            return CommandLineApplication.Execute<Program>(args);
+            try
+            {
+                return CommandLineApplication.Execute<Program>(args);
+            }
+            catch (Exception e)
+            {
+                Console.Error.WriteLine(e.ToString());
+                return 1;
+            }
+
         }
     }
 }

sdk/schemaregistry/Microsoft.Azure.Data.SchemaRegistry.ApacheAvro/README.md

@@ -41,7 +41,7 @@ The simpliest way is to use the [Azure portal][azure_portal] and navigate to you
 
 Once you have the Azure resource credentials and the Event Hubs namespace hostname, you can create the [SchemaRegistryClient][schema_registry_client]. You'll also need the [Azure.Identity][azure_identity] package to create the credential.
 
-```C# Snippet:CreateSchemaRegistryClient
+```C# Snippet:CreateSchemaRegistryClient2
 string endpoint = "<event_hubs_namespace_hostname>";
 var credentials = new ClientSecretCredential(
     "<tenant_id>",

sdk/schemaregistry/Microsoft.Azure.Data.SchemaRegistry.ApacheAvro/tests/Samples/Sample01_ReadmeSnippets.cs

@@ -17,7 +17,7 @@ public class Sample01_ReadmeSnippets : SamplesBase<SchemaRegistryClientTestEnvir
         [Test]
         public void CreateSchemaRegistryClient()
         {
-            #region Snippet:CreateSchemaRegistryClient
+            #region Snippet:CreateSchemaRegistryClient2
             string endpoint = "<event_hubs_namespace_hostname>";
             var credentials = new ClientSecretCredential(
                 "<tenant_id>",