Marketing email is still produced in this exact same way at some companies - ask me how I know!

(If anyone isn’t familiar with this, it’s because for security reasons we’ve all decided email should use an intentionally gimped de facto (non-)standard which only supports a few little dabs of CSS - 90% of email is formatted with strictly 90s technology.

And by “we” I mean that’s what Google and MS allow in their clients, so it’s very pointless to try to go beyond that given their combined usage share.

Or even a regular expression.