Misleading error in Add Product Attribute screen

[milossh]

Preconditions

1. Magento 2.2.5

Steps to reproduce

1. Navigate to Store->Attributes->Product
2. Add new attribute
3. Set Attribute Code to Foo_Bar
4. Click Save

Expected result

1. An error message saying that capital letters are not allowed in Attribute Code field

Actual result

1. Following error message:

Please use only letters (a-z), numbers (0-9) or underscore (_) in this field, and the first character should be a letter.

[magento-engcom-team]

Hi @milossh. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

• Summary of the issue
• Information on your environment
• Steps to reproduce
• Expected and actual results

Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

@magento-engcom-team give me {$VERSION} instance

where {$VERSION} is version tags (starting from 2.2.0+) or develop branches (2.2-develop +).
For more details, please, review the Magento Contributor Assistant documentation.

@milossh do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

[milossh]

Yes.

@milossh , thank you for your report.
We've acknowledged the issue and added to our backlog.