Is there a way to filter flashcards?

Is there a way to filter flashcards?
If so, how?

Yes there is, you would create groups of cards by tagging them, and then reviewing the cards with the specific tag:

- {{cards([[testgroup1]])}}
- {{cards([[testgroup2]])}}
- Subject 1: [[testgroup1]]
	- What is this? #card
		- This is a test
- What is this then? #card
	- This is a second card
- Subject 2 [[testgroup2]]
- More questions? #card
	- Yes, it is so

You can also tag an individual card:

- What is a gerund? #card #grammar