This produces inputs to an arbitrary regex library. You could of course build a regex "(w1|w2|w3|...|wN)" for words w1...wN (assuming an efficient regex

This produces inputs to an arbitrary regex library. You could of course build a regex "(w1|w2|w3|...|wN)" for words w1...wN (assuming an efficient regex library) and save the hassle, but the frak output will hopefully be more compact.