Use regular expressions to find the first digit, then return the input string from the first character until the character before the first digit using this expression:
left("Nutzung", regexp_match("Nutzung", '\\d') - 1)
Use regular expressions to find the first digit, then return the input string from the first character until the character before the first digit using this expression:
left("Nutzung", regexp_match("Nutzung", '\\d') - 1)