House numbers & additions

How to provide input on house numbers & additions?

As a general rule of thumb:
  • A house letter is always a letter and always only 1 character
  • House number addition (toevoeging) can be everything in letters or numbers, and can be more than 1 characters
Examples:
  1. 1.
    house letter: A, house addition: 02, houseaddition input as string "A02"
  2. 2.
    house letter: '', house addition: 02, houseaddition input as string "02"
  3. 3.
    house letter: A, house addition: '', houseaddition input as string "A"
  4. 4.
    house letter: '', house addition: '', houseaddition input as string ""
  5. 5.
    house letter: '', house addition: 2B, houseaddition input as string "2B"
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