I was agreeing with your point about regexes, that it's good to avoid trying to deal with all the corner cases yourself when you're just trying to write a small script.
Ah, understood! CSV is funny, it seems like a more trivial thing than it really is, and its human readability sort of invites broken approaches in a way that something like Parquet would not.
XML is somewhere in the middle--I've seen some horrible abuses of CDATA sections way back when--but at least there are accepted ways to prove what's invalid.
