Filter Environment Specific Constant

Could you explain a little more please?

The only way I've figured out so far to distinguish Environment Specific constants from others is to manually put in a specific text tag into the Description at create/edit time, like "[ES]" or similar.  I don't know of any systematic one to distinguish them from others, other than to gather all constants into one app, export them, and see what the deployment customization file says (since it would only reference environment-specific ones).

What's your use case exactly?

One way of doing this is to have a package created for all the constants in your application and before you try to deploy the package you will have the Customization file in which all the environment specific constants will be listed out

Hi [mention:30bb505c1ca4449ca754b36b7a8ed1d7:e9ed411860ed4f2ba0265705b8793d05] 

Add all constants to a package and then export that newly created package. While downloading the exported package inside, any constants are marked as environmental constants. By default, it shows the import customization file. While downloading the import customization file in which all the environmentally specific constants will be listed out.

I prefix them with ENV_

You have to manually filter out with any of the mentioned methods, but it is recommended to name the environment constant in an easily identifiable manner just for this case.

Start the name with the application prefix, use an additional prefix to group env constants.

APP_ENV_CONSTANT_NAME