Not so useless. In my experience LLMs are about 50/50 on making a regex that actually works and covers the cases you asked it for. Even less when you get into cases needing advanced features like backreferences and lookahead.

Anecdotal data point, writing and maintaining regex is still a core part of my job. Not useless at all for me :)

A little bit early to tell.

Let’s wait how affordable, available and good AI is when the companies turn to profit maximization and enshittification begins