R Under development (unstable) (2024-03-01 r86033 ucrt) -- "Unsuffered Consequences"
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> KOR.addrlink::split_address(c("Teststr. 8-9 a", "Erster Weg 1-2", "Ahornallee 100a-102c", 
+ "Stra\u00dfe des 1. Mai 10/12", "Emmerich-K\u00e1lm\u00e1n-Stra\u00dfe 15"))
                 Strasse Hausnummer Hausnummernzusatz
1               Teststr.          8                 A
2             Erster Weg          1              <NA>
3            Ahornallee         102                 C
4      Straße des 1. Mai         10              <NA>
5 Emmerich-Kálmán-Straße         15              <NA>
> 
> proc.time()
   user  system elapsed 
   0.17    0.03    0.18