module RuboCop::Ext::RegexpParser::Expression::Base

Please open issue if you need other locations

^ end
^ begin
^^^^^ body
^^^^ quantifier
^^^^^^^^^ expression
[a-z]{2,}
E.g.

- begin/end: for `[` and `]` (only CharacterSet for now)
- quantifier: for `+`, `{1,2}`, etc.
- expression: complete expression
@returns a location map like `parser` does, with:

def loc
  @loc ||= Map.new(expression, **build_location)
end