I'm using zsh-syntax-highlighting[1] for that, which requires 4.3+, so it will work here.

It's pretty great as a starting point, but it really could use more people writing highlighter plugins for different things. It's on my list of things to figure out how to do eventually.

[1] https://github.com/zsh-users/zsh-syntax-highlighting

It was already possible with https://github.com/zsh-users/zsh-syntax-highlighting.

Fish is another shell that supports syntax highlighting out of the box.