refs https://github.com/TryGhost/Team/issues/828
- When detecting email segments and later creating a member filter out of this data we only care about unique segments otherwise we'd be creating multiple batches with the same segment filter
refs https://github.com/TryGhost/Team/issues/828
- This is experimental segment extraction logic, more to follow. Alllows to extract arrays of email segments used in the email's HTML content
refs 474e6c4c45
- The method was not easy to understand after skimming through it.
- As we are working on developing a similar pattern for upcoming similar featured created a basic test suited to see input/output relation clearly
