Should have mentioned -- this works in #Mastodon and #glitchsoc servers from 4.2.0 onwards. The "from" filter works from 3.5.0 onwards.
The "from" filter works in #gotosocial 0.16.0 and up.
And the "from" and "language" filters work in #friendica 2024.3 and later releases.
If other server types support these search queries let me know.
If you want to know more about these options Luca's (@luca) blog post at https://lucahammer.com/2024/04/25/mastodon-advanced-search-guide-and-operators is very informative.