My code above isn't the exact syntax. I doubt I implemented array equality. I was just demonstrating that an array would be returned when indexing the dict with a regexp.

I know nothing was published or released. I actually left BNR/NT less than a year after the language went into production (going to say July, 1990) - I don't really know how long it remained there. Perl was popular, and Tcl was definitely a 'thing' in the lab at the time - the writing was on the wall for home-grown languages.