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There is a newer version: 4.23.0.17664

Why is this an issue?
Character classes in regular expressions are a convenient way to match one of several possible characters by listing the allowed characters or
ranges of characters. If a character class contains only one character, the effect is the same as just writing the character without a character
class.
Thus, having only one character in a character class is usually a simple oversight that remained after removing other characters of the class.
Noncompliant code example
r"a[b]c"

Compliant solution
r"abc"

Exceptions
This rule does not raise when the character inside the class is a metacharacter. This notation is sometimes used to avoid escaping (e.g.,
[.]{3} to match three dots).