`az role definition list` should be case-insensitive

[jiasli]

Describe the bug

az role definition list is case-sensitive:

> az role definition list --scope / --name Reader
[
  {
    "assignableScopes": [
      "/"
    ],
    "createdBy": null,
    "createdOn": "2015-02-02T21:55:09.880642+00:00",
    "description": "View all resources, but does not allow you to make any changes.",
    "id": "/providers/Microsoft.Authorization/roleDefinitions/acdd72a7-3385-48ef-bd42-f606fba81ae7",
    "name": "acdd72a7-3385-48ef-bd42-f606fba81ae7",
    "permissions": [
      {
        "actions": [
          "*/read"
        ],
        "condition": null,
        "conditionVersion": null,
        "dataActions": [],
        "notActions": [],
        "notDataActions": []
      }
    ],
    "roleName": "Reader",
    "roleType": "BuiltInRole",
    "type": "Microsoft.Authorization/roleDefinitions",
    "updatedBy": null,
    "updatedOn": "2021-11-11T20:13:47.862868+00:00"
  }
]
> az role definition list --scope / --name reader
[]

This is inconvenient when showing a role definition.

Related command

az role definition list

Errors

N/A

Issue script & Debug output

N/A

Expected behavior

az role definition list should be case-insensitive.

Environment Summary

> az --version
azure-cli                         2.77.0 *

core                              2.77.0 *
telemetry                          1.1.0

Extensions:
ssh                                2.0.6

Dependencies:
msal                            1.34.0b1
azure-mgmt-resource               23.3.0

Python location 'C:\Program Files\Microsoft SDKs\Azure\CLI2\python.exe'
Config directory 'C:\Users\jiasli\.azure'
Extensions directory 'C:\Users\jiasli\.azure\cliextensions'

Python (Windows) 3.13.7 (tags/v3.13.7:bcee1c3, Aug 14 2025, 14:15:11) [MSC v.1944 64 bit (AMD64)]

Additional context

No response

[azure-client-tools-bot-prd]

Hi @jiasli,

2.77.0 is not the latest Azure CLI(2.81.0).

If you haven't already attempted to do so, please upgrade to the latest Azure CLI version by following https://learn.microsoft.com/en-us/cli/azure/update-azure-cli.

[yonzhan]

Thank you for opening this issue, we will look into it.