Trouble with workspace.moduleMap

[raiguard]

I am having trouble implementing / understanding workspace.moduleMap. In Factorio, we use __name__ prefixes in order to require files from other mods. This needs to be translated to remove the underscores. For example, require("__flib__.math") should transform into require("flib.math") so that the language server can pick up the file from the flib library directory.

However, I can't get this to work. Am I misunderstanding how this feature works? Here is my config:

{
	"runtime": {
    	"version": "Lua5.2"
	},
	"workspace": {
        "library": [
            "{env:FACTORIO_PATH}/data",
            "{env:FACTORIO_LIBRARY_ROOT}",
            "{env:FACTORIO_MODS_ROOT}/flib",
            "{env:FACTORIO_MODS_ROOT}/sw-rates-lib"
        ],
    	"moduleMap": [
            {
                "pattern": "^__(.*)__(.*)$",
                "replace": "$1$2"
            }
    	]
	}
}

[CppCXY]

from the code

the moduleMap only work for replace file real path to virtual filepath, and fit rust regex grammar