magento/magento2#5035 Cannot subscribe to events with a number in name

[Mobecls]

Allow to use digits at names of events

Description

Fixed inconsistence in names in events and sections in system.xml

Fixed Issues

1. I can not to subscribe on change of all sections in Stores ->Configuration using event admin_system_config_changed_section #5035 I can not to subscribe on change of all sections in Stores ->Configuration using event admin_system_config_changed_section

Manual testing scenarios

1. M 2.0.7
2. Create extension, create etc/adminhtml/system.xml there
3. add section tab with id, that contains number, in my case "b2b" https://drive.google.com/a/interiorwebdesign.com/file/d/0BzTvZltZJMLlemNCOGVwdUM5S00/view?usp=drivesdk
4. create etc/adminhtml/events.xml and add event listener to listen to changing of this section https://drive.google.com/a/interiorwebdesign.com/file/d/0BzTvZltZJMLlRFpqOEIyc2RKRW8/view?usp=drivesdk

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-cicd2]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

[ishakhsuvarov]

Hi @Mobecls
Please sign CLA so that we can proceed with the review and merge of the Pull Request

Thank you

[miguelbalparda]

There is another fix for this already merged in 2.3 with no backports. Since your fix is pretty much the same, I'll ask internally to see the next steps.

[Mobecls]

signed as well

[miguelbalparda]

@aleksmitskevich can you please also sign the CLA?

[miguelbalparda]

Closing in favor of #12758