alt Hacker News75-80% [1], 90%, 99% [2]. In other words, no one has any idea.
I doubt it's anywhere that high because even if you don't write anything fancy and simply capitalize the first word like you'd normally do at the beginning of a sentence, the regex won't flag it.
Anyway, I don't really care, might just as well be 99.99%. This is not a hill I'm going to die on :P
It compares to lowercase input, so doesn't matter. The rest is still valid