Missing Cop for constant regexp?

[marcandre]

The following code has 3 anti-patterns:

def self.tokens(pattern)
   pattern.scan(TOKEN).reject { |token| token =~ /\A#{SEPARATORS}\Z/ }
end

This issue is to identify that /\A#{SEPARATORS}\Z/ should be isolated as a constant, since all it's dynamic components are constants.

See: rubocop/rubocop-ast#65

[marcandre]

Alternative solution (easy auto-correct but much less known) is to correct to /\A#{SEPARATORS}\Z/o