`(?N)` where `N` is group number and `(?&name)` where `name` is named group are known as subexpression calls. The third-party `regex` module (https://pypi.org/p

`(?N)` where `N` is group number and `(?&name)` where `name` is named group are known as subexpression calls. The third-party `regex` module (https://pypi.org/project/regex/ https://pypi.org/project/regex/) supports this and more such PCRE features.