2.5: Regular Expressions: Back References - Programming with Text

From a channel Lumen includes in full: Daniel Shiffman, an NYU ITP professor, teaches creative coding and algorithms on The Coding Train: full p5.js and Nature of Code courses plus long coding challenges (wave function collapse, fractals, physics) written live and explained as he goes.

A 4-minute video from The Coding Train's catalogue; the title names its topic.

Video by The Coding Train, played through YouTube's embedded player.