[Monitor] Fix issue 20207, Used for case-insensitive URI matching (Azure#20423)

* Fix issue 20207, Used for case-insensitive URI matching

* Fix issue 20207, Used for case-insensitive URI matching

* update changelog

Co-authored-by: Jin Lei <54836179+msJinLei@users.noreply.github.com>

Author: lijinpei2008

src/Monitor/Monitor/ChangeLog.md

@@ -19,6 +19,7 @@
 -->
 
 ## Upcoming Release
+* Fixed bug for `Remove-AzDataCollectionRuleAssociation` [#20207]
 * Added support for test notifications cmdlets
   * `Test-AzActionGroup`
 * Fixed start time parameter description of `Get-AzActivityLog` [#20409]

src/Monitor/Monitor/DataCollectionRules/RemoveAzureRmDataCollectionRuleAssociationCommand.cs

@@ -14,6 +14,7 @@
 
 using System;
 using System.Management.Automation;
+using System.Text.RegularExpressions;
 
 using Microsoft.Azure.Commands.Insights.OutputClasses;
 using Microsoft.Azure.Management.Internal.Resources.Utilities.Models;
@@ -83,12 +84,12 @@ protected override void ProcessRecordInternal()
                     break;
                 case ByInputObject:
                     var dcra = new ResourceIdentifier(InputObject.Id);
-                    TargetResourceId = InputObject.Id.Replace("/providers/Microsoft.Insights/dataCollectionRuleAssociations/" + dcra.ResourceName, "");
+                    TargetResourceId = Regex.Replace(InputObject.Id, "/providers/Microsoft.Insights/dataCollectionRuleAssociations/" + dcra.ResourceName, "", RegexOptions.IgnoreCase);
                     AssociationName = InputObject.Name;
                     break;
                 case ByResourceId:
                     var dcraById = new ResourceIdentifier(AssociationId);
-                    TargetResourceId = AssociationId.Replace("/providers/Microsoft.Insights/dataCollectionRuleAssociations/" + dcraById.ResourceName, "");
+                    TargetResourceId = Regex.Replace(AssociationId, "/providers/Microsoft.Insights/dataCollectionRuleAssociations/" + dcraById.ResourceName, "", RegexOptions.IgnoreCase);
                     AssociationName = dcraById.ResourceName;
                     break;
                 default: