product_types.xml doesn't allow numbers in modelInstance

[domeglic]

Preconditions

1. Magento v2.2.2

Steps to reproduce

1. Have a module with numbers in vendor name
2. Create product_types.xml and define a new type

Expected result

1. No XSD validation errors

Actual result

1. XSD validation error that modelName does not validate.

product_types_base.xsd does not allow numbers in the modelName type.
Furthermore, searching for the pattern [a-zA-Z_\\] finds more files where this might be a problem.

Similar to #4470.

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

[magento-engcom-team]

Hi @lisovyievhenii. Thank you for working on this issue.
Looks like this issue is already verified and confirmed. But if your want to validate it one more time, please, go though the following instruction:

• 1. Add/Edit Component: XXXXX label(s) to the ticket, indicating the components it may be related to.

• 2. Verify that the issue is reproducible on 2.3-develop branch

  Details

  - Add the comment @magento-engcom-team give me 2.3-develop instance to deploy test instance on Magento infrastructure.
  - If the issue is reproducible on 2.3-develop branch, please, add the label Reproduced on 2.3.x.
  - If the issue is not reproducible, add your comment that issue is not reproducible and close the issue and stop verification process here!

• 3. Verify that the issue is reproducible on 2.2-develop branch.

  Details

  - Add the comment @magento-engcom-team give me 2.2-develop instance to deploy test instance on Magento infrastructure.
  - If the issue is reproducible on 2.2-develop branch, please add the label Reproduced on 2.2.x

• 4. If the issue is not relevant or is not reproducible any more, feel free to close it.