It is literally a quine, viewed as a program in a language where (for example) the code consists of a regular expression and the output is the sequence of all strings matching that regular expression.
In the esolang community, the name for this variation of Quine is a Narcissist or Narcissus program. You can see a bunch of examples in a number of different languages on the Rosetta Code website.
It also reminded me about quines, I especially like the Quine Relay project which uses 100 different programming languages (each producing an input for the next one) to finally produce its own code https://github.com/mame/quine-relay