To my knowledge no there is no such feature at this time, but the ability to filter communities has been requested a lot over the past couple days.

Lemmy is not a business, so it's only a matter of whether and when the developers feel like it's a priority. I believe their priority recently has been making sure the platform doesn't implode due to either security issues or the extreme load placed on a few servers.

Sounds like a fantastic feature request.

Have you had a look if there is one already?

The connect app has a bunch of blocking options, including by keyword or entire instances. Not regex though.

Kbin has the ability to filter out specifics, but it's simple wildcard matching, not regex.

On jerboa you can block a community without opening the post. I like to sort all/new to find new things and then block most of the porn and sports.