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Regular Expression
r"
^([^K]|K($|[^O]|O($|[^R]|R($|[^O]|O($|[^N]|N($|[^K]|K($|[^O]|O($|[^R]|R($|[^K]|K($|[^O]))))))))))*$
"
Input 1
1
New
KORONKORKO
Extraction
KORONKORKO