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There is a newer version: 4.23.0.17664

Why is this an issue?
There are several reasons to use a group in a regular expression:

   to change the precedence (e.g. do(g|or) will match 'dog' and 'door') 
   to remember parenthesised part of the match in the case of capturing group 
   to improve readability 

In any case, having an empty group is most probably a mistake. Either it is a leftover after refactoring and should be removed, or the actual
parentheses were intended and were not escaped.
Noncompliant code example
r"foo()" # Noncompliant, will match only 'foo'

Compliant solution
r"foo\(\)" # Matches 'foo()'