Hello, I've seen similar Ideas, but not quite as explicit as mine. I'd be surprised if the desktop client doesn't employ a regexp search in the background, once something is searched for. If so, why not extend that into the user interface?
That would solve any and all filtering questions, for those inclined to use it in that way, and wouldn't have to be anything to tout much since many might not care, but a silent availability would be nice.
The above, with the added twist of having keywords for including the metadata in the search would nice, i.e, record label, year and so on, provided it's available in the first place.
Edit: Idea has been posted again here.
Updated on 2018-11-15
Your idea was submitted a while ago and unfortunately didn't receive the amount of kudos needed to stay active in the ideas board (100 Kudos per year).
In order to keep the Ideas Exchange clearer I'll close this idea for now, but this doesn't mean Spotify rejected this idea.
If you think this is an idea which needs to be implemented, you're welcome to post it in slightly different again 🙂
Have a nice day!