[Feature] Capture groups

Hi, First thanks for this, it's great. Would it be possible to implement capture groups ? IE contrived example: text: `my_function2()` search: `(.*)fun.*(\d+)` replace: `"$2$1$2"` gives: `"2my_2"` Note how I gave you nice edge cases while i was at it 🤣 Anyway just a nice feature to have imo. Thanks.