Magento 2 Store Code validation regex: doesn't support uppercase letters in scope code

[attheCube]

Preconditions (*)

1. Magento v2.3.3
2. Magento 2.4-develop

Steps to reproduce (*)

1. Setup stores/store-groups/websites with uppercase scope codes via setup script.
2. Try to use to show configuration for this store via console.
   => bin/magento config:show --scope=store --scope-code=de_AT

Expected result (*)

1. Output of store configuration

Actual result (*)

1. Output of error message:
   "The scope code can include only lowercase letters (a-z), numbers (0-9) and underscores (_). Also, the first character must be a letter."

Similar report: #11996

This report resulted in adjustment of the error message because the former reporter had no good reason.

One good reason why it should be possible to use uppercase letters in store code, is to differentiate regions in store code. Especially for using storecodes within url.
So you could use at least 'de_DE', 'de_AT', 'en_US' or 'en_UK' as store codes, which is very useful in urls.

To be RFC 4646 (https://tools.ietf.org/html/rfc4646) conform, there has to be the possibility to use hyphens for store codes, too.

Surely it would be possible to do something weird by having this possibility, but that lies in the responsibility of the projects lead.

Additonal information:

See comment

[m2-assistant]

Hi @attheCube. Thank you for your report.
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[AnnaShepa]

@magento give me 2.3-develop instance

[magento-engcom-team]

Hi @AnnaShepa. Thank you for your request. I'm working on Magento 2.3-develop instance for you

[m2-assistant]

Hi @AnnaShepa. Thank you for working on this issue.
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[magento-engcom-team]

Hi @AnnaShepa, here is your Magento instance.
Admin access: https://i-25668-2-3-develop.instances.magento-community.engineering/admin
Login: admin Password: 123123q
Instance will be terminated in up to 3 hours.

[attheCube]

Hi,
thanks for the instance to test.
In administration and in frontend no message are thrown in this instance.
But the message is thrown while using bin/magento config:show --scope=stores --scope-code=de_AT as I mentioned above and I don't have access to console to test.

The error message is thrown in the following files:

• vendor/magento/framework/App/Config/Scope/Validator.php
• vendor/magento/framework/App/Scope/Validator.php

The regular expression in these files does not allow uppercase characters.

It seems that this validation functionality is not used for saving scopes and using store codes in url, but it is used for the config-command and may be for setting store-codes via environment variables also.