Yeah 10 million regexes is huuuuge. Aho-Corasick can barely handle 10 million literals.

Future work is definitely trying to make the regex engine scale better with more patterns. Currently, it will crap out well before 10 million regexes, and I'm not sure that goal is actually attainable. But it can certainly be better than what it is today.

And of course, Hyperscan is really the gold standard here as far as multi-pattern searching goes. I'm not sure how well it will handle 10 million patterns though.