INTRODUCTION
This Module prevents field machine name from ending (_) underscore. For example, when you have brackets at the end of a label, e.g., "Address (2)", you end up with a trailing "_" character — field_address_2_.
Perhaps, you simply want to have good machine name of field, especially when it is ending with underscore or having two/more underscore and it has been truncated than you must use this module.
INSTALLATION
Refer:
https://www.drupal.org/docs/8/extending-drupal-8/installing-drupal-8-mod...
REQUIREMENTS
No Requirements.
CONFIGURATION
Configuration can be done if user has "administer site configuration" permission
Configuration can be access admin/config/underscore_handle/underscoresetting url
* Check "End Underscore" if want to validate underscore in end
* Check "Double underscore" if want to validate double underscore in filed
Machine name.
Project information
Unsupported
Not supported (i.e. abandoned), and no longer being developed. Learn more about dealing with unsupported (abandoned) projectsObsolete
Use of this project is deprecated.- Project categories: Administration tools, Site structure
- Created by rajveergangwar on , updated
Stable releases for this project are covered by the security advisory policy.
There are currently no supported stable releases.

