@ismail1432 I like this. Thanks for contributing! However, I'd like to propose to change the location of this change. The routing.rst file is mainly for newcomers and this feature is mostly for advanced users and edge cases. I propose to do the following:

1. Remove all the changes from routing.rst.
2. Edit the routing/external_resources.rst file and add this example in the configuration block of the Prefixing Imported Routes section. We show YAML, XML and PHP ... we need to add a new config format called .. code-block:: php-annotations inside the existing .. configuration-block::. You just need to update the example contents to match the existing config example.

If you need any help with this, please tell me. Thanks!

Ok I'll do that
Thanks

Please don't make any change yet! I think I'm messing things 😅

There are two features (URL prefix, route name prefix) and two different scenarios (config files, @route annotation).

In the past we had: URL prefix + config files or @route ... in 3.4 we added route name prefix + @route and in 4.1 we added route name prefix + config files. So, the changes are more complex than I imagined. We'd need to:

1. In 2.7 branch, update routing/external_resources.rst and add an example of PHP annotations for the existing example. And rename the section from Prefixing Imported Routes to Prefixing the URLs of Imported Routes
2. In 3.4 branch, update routing/external_resources.rst and add a new section called Prefixing the Names of Imported Routes and add only the example of PHP annotations (according to https://symfony.com/blog/new-in-symfony-3-4-prefix-all-controller-route-names).
3. In 4.1 branch, update routing/external_resources.rst and in the section added above (Prefixing the Names of Imported Routes) add the example of the config files (according to https://symfony.com/blog/new-in-symfony-4-1-prefix-imported-route-names).

So, in this PR you can take care of 2. and we'll finish 1. and 3. in separate PRs. Thank you and I'm sorry for all the trouble.

Ok, thanks for clarification.
I'll do the step 2
Have a nice day

Hi @javiereguiluz I create a new PR #9186 for step 2

Closing as fixed because the three issues are now fixed and merged:

1. Improved a routing example to show annotations #9241
2. add Prefixing the Names of Imported Routes #9186
3. Documented the name prefix feature for YAML, XML and PHP files #9242

Thanks!