Issy Long d4d413db62
String interpolations in regexps should also be allowed
- This came up in Cask `simply-fortran`:

```
Scanning /opt/homebrew/Library/Taps/homebrew/homebrew-cask/Casks/simply-fortran.rb
send_node: s(:send, nil, :arch), send_node.parent: s(:begin,
  s(:send, nil, :arch)), send_node.parent.parent: (regexp
  (str "href=.*?simplyfortran[._-]v?(\\d+(?:\\.\\d+)+)")
  (begin
    (send nil :arch))
  (str "\\.dmg")
  (regopt :i))
Casks/simply-fortran.rb:2:3: C: Cask/NoOverrides: Do not use a top-level arch stanza as the default. Add it to an on_{system} block instead.
Use :or_older or :or_newer to specify a range of macOS versions.

  arch arm: "-arm64", intel: "-x86_64"
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

1 file inspected, 1 offense detected
```
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