Different replace behavior

[kiliankoe]

Hi,

I'm trying to remove the contents of a string matching the following regex: (\((?:[A-N]\d?(?:, )?)+\)).

The idea is to remove these allergen-notices from a string like this:

Frikadelle von Rind und Schwein (A, A1, C, I, J) mit Paprika-Zwiebelgemüse (J), dazu Spätzle (A, A1, C)

I tried the following:

let regex = Regex(#" (\((?:[A-N]\d?(?:, )?)+\))"#)
let title = oldTitle.replacingAll(matching: regex, with: "")

For some reason this leads to "Paprika-Zwiebelgemüse (J)" being turned into "Paprika-Zwiebelgemüs)" and not "Paprika-Zwiebelgemüse" as expected.

When I use the native String API (.replacingOccurrences(of: #" (\((?:[A-N]\d?(?:, )?)+\))"#, with: "", options: .regularExpression)), it works like it should.

Is this a bug in Regex or am I doing something wrong? This is on iOS in case that's relevant.

Thanks!