R Under development (unstable) (2024-03-01 r86033 ucrt) -- "Unsuffered Consequences"
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> KOR.addrlink::split_number(c("8-9 a", "1-2", "100a-102c", "2/3", "25/27a", "3 5"))
  Hausnummer Hausnummernzusatz
1          8              <NA>
2          1              <NA>
3        100                 a
4          2              <NA>
5         25              <NA>
6          3              <NA>
> 
> proc.time()
   user  system elapsed 
   0.14    0.07    0.20