Mass tagging expert

For people that know how mass tagging works:

• mass tagger
• mp3tag format strings
  • import all
  • import only date (mislabelled 'year')
  • convert date to year (use in a Format Value action)
    • Extracts YYYY[-MM[-DD]] from:
      • YYYY
      • YYYY-MM
      • YYYY-MM-DD
      • YYYY-MM-DD--DD
    • Blanks anything else, inc
      • YYYY--YYYY
      • YYYY|YYYY
      • YYYY|YYYY|YYYY

• • convert date to year (use in a Format Value action)
    • Extracts YYYY from:
      • YYYY
      • YYYY-MM-DD
      • YYYY-MM-DD--DD
    • Blanks anything else, inc
      • YYYY--YYYY
      • YYYY|YYYY
      • YYYY|YYYY|YYYY