What would group (3) be of match of 1(23)(4(56)78)9(0)?

Answer 1

Why don't you run the python code to see what you get?

Answer 2

Lemmie try

Answer 3

56

Answer 4

56

Answer 5

Group (0) returns the whole match 1234567890
Group (1) matches 23
Group (2) matches 478
Group (3) matches 56
...