fix regex for darwin-aarch64 compatability

[hlolli]

Currently I'm unable to run poetry2nix on aarch64-darwin, same as noted in this ticket NixOS/nix#4758 I'm also getting

error: invalid regular expression '^.*?(egg|tar|tar.bz2|tar.gz|tar.lz|tar.lzma|tar.xz|tbz|tgz|tlz|txz|whl|zip)'

I believe this is related to differences in stdlib++ versions, altough this is not my area of expertise.
The question mark isn't necessary here, I hope this showcases that

nix-repl> builtins.match "?(egg)" "asdf"
error: invalid regular expression '?(egg)'

       at «string»:1:1:

            1| builtins.match "?(egg)" "asdf"
             | ^
            2|

nix-repl> builtins.match "^.*?(egg)" "asdf"
error: invalid regular expression '^.*?(egg)'

       at «string»:1:1:

            1| builtins.match "^.*?(egg)" "asdf"
             | ^
            2|

nix-repl> builtins.match "^.*(egg)" "asdf"
null

nix-repl> builtins.match "^.*(egg)" "asdf.egg"
[ "egg" ]

nix-repl> builtins.match "^.*(egg)" ""
null

nix-repl> builtins.match "^.*(egg)" "egg"
[ "egg" ]

nix-repl> builtins.match "^.*(egg)" ".egg"
[ "egg" ]

[adisbladis]

Thank you for this fix and excellent description!