MeshGenerator that only keeps specific blocks?

[travismui]

Hi all, just wondering if there's a MeshGenerator that lets you only keep a specific list of blocks? Something like BlockDeletionGenerator except block is the list of blocks you want to keep, rather than delete. The context is that I'm loading in a mesh with FileMeshGenerator but I only want to retain a specific set of blocks, and that didn't seem to be a parameter that you could specify. Thanks!

[GiudGiud]

You can do this in two steps, with
https://mooseframework.inl.gov/source/meshgenerators/ParsedSubdomainMeshGenerator.html
and exclude the subdomains you actually care about.

Then delete the new subdomain this generator created

[GiudGiud]

Adding the option for BlockDeletionGenerator to allow flipping the list meaning would be a reasonable change as well imo.

[travismui]

Ah sneaky, that does work indeed thanks @GiudGiud. I agree though, it would be cleaner to just have this in BlockDeletionGenerator, I created an issue and I can work on it when I have some free time.