How Does Git Know What a Python Function/Class Definition Looks Like?

I really like the "TIL" format. I tweeted this a few weeks ago and it seemed to have really resonated with people.

Very thin content. There were really only two options: regex or parser. This is close to "You won't believe what happened next" level of content.

So uhm, what happens if someone puts class Datasette: in a multiline string?

The regex has a clause to cover that case?

It doesn't.

And I finally took the time to test it; git does the wrong thing.

Idk if it's display only (in which case I guess a 99.99% solution is fine), or if it's actually used somehow say when applying a patch, in which case it may lead to security issues.