Remove all numbers followed by parenthese with Regex in R (use negative lookaheads?!)

I want to remove all numbers that are immediately followed by a ).
My Strings look like this:

Gmünd 5) 6) 7)
Hermagor am See 3)

So I’d like to have the result:

Gmünd
Hermagor

I think the solution must involve negative lookaheads, but I am not really sure how to do that.

>Solution :

If you have no other digits in your strings a lookaround is not needed. If you do however, especially in the context of ( and ), then lookaround, specifically negative lookbehind, is needed:

gsub("(?<!\\()\\s?\\d+\\)", "", strings, perl = TRUE)
[1] "Gmünd"            "Hermagor"         "Tegernsee (4)"    "Some (stuff) 444"

Data:

strings <- c("Gmünd 5) 6) 7)", "Hermagor 3)", "Tegernsee (4)", "Some (stuff) 444")