Filters in the text part of the search bar seems like a really good idea, specifically in the style you'd see in the Minecraft mod JEI by mezz

Examples of filters and what they do:

#allows you to filter by the text inside of the mod description itself, so if you don't remember exactly what the mods name is but remember what it does you can find it easier (this may be a bit extreme, parsing that much data may be too much so it's understandable if you take a different route.)

| allows you to search multiple different mods at once, think of it like a separate search bar.

@ allows you to search by author name, allowing you to find all mods by an author easier.

! allows you to exclude specific terms in the search, so for example if you want a car mod but specifically don't want bikes / motorcycles you can search car !bike !motorcycle

This one is not in the mod as far as I am aware but maybe an % filter that specifically filters for that word without including things that partially match that word, so for example if you want just the word Farm without finding results for Farming you could search %farm, this would remove any and all mods from the list without the word "farm" specifically, non case sensitive, but that gives me another idea.

$ could act as the case sensitive sign, although I can't really think of many uses for this it may be useful in some niche situations.

These can all be combined in different ways with a hierarchy system where | is the top, separating different searches, !is next in line allowing you to remove all other terms with for example !@creator or !#word, @ is the next in line allowing you to find a specific creator in each search bar.

I believe there are other filters in the mod but this is the most commonly used ones for me specifically. I suggest this as a separate system from the original filters tab for more specific filters that aren't as easy to implement into the tab itself. Think of it like the filters tab goes first, then these for more specific searches.