The closest so-far appears to be Kermit. It's been around since CP/M, but apparently there's still no centralised language reference and the syntax predates Perl.

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[–] froh42@lemmy.world 1 points 6 months ago* (last edited 6 months ago) (1 children)

I used expect a lifetime ago to reliably talk to a bunch of very strange ISDN modems.

https://www.tcl.tk/man/expect5.31/expect.1.html

I think something like expect also exists for more modern languages, but tcl is still easy enough to learn (just a little unusual, everything is a string)

[–] vk6flab@lemmy.radio 1 points 6 months ago

That's several recommendations for expect. I'll start digging. Thank you.