You can use backreferences \1 \2 etc. but you can also give them names explicitly.
it looks like this: (?<name>inner-regex)
Some flavors support it, kotlins doesn’t apparently.

I don’t actually know whether POSIX grep would support named groups :o

Love seeing a GNOME rice, I tried some GNOME ricing on a Fedora myself, however I was unable to get any further than installing Extensions ‘Just Perfection’ to hide some elements or using ‘Burn my Windows’, which I loved.

What did you use to style your GNOME-Shell Components?