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The reason is that they basically rely on using the Oniguruma regret engine, and reimplementing that in JS would be hella slow.

> using the Oniguruma regret engine

I'm surprised I've never seen that typo for regex before. It's wonderful.

Sometimes you feel a regret. "I know!" you say, "I'll fix things with regretular expressions." Now you have two regrets.

Maybe "I'll fix this with expressions of regret."

lol I typed that on an IOS device correctly but it autocompleted it since "regex" isn't a real word apparently.

Well no, it's a portmanteau of "regular" and "expression".