The regex works, but you should still place a space between the identifier and the name. Also, if you copy and paste a formula as regular text, then this forum might change the formatting. It is best to paste it in a code block by using backticks (`).
As for the solution:
{
"identifier": "MUE-2409290",
"name": "BeautyBabyF testfolder"
}
I used the input above in the following formula:
And the result is:
You can copy and paste this and replace the references to your modules:
{{replace(lower(28.identifier + space + 28.name); "/[^a-z0-9]+/g"; "-")}}
Does that work for you?
Cheers,
Henk