Swift String Extension to Trim Trailing Punctuation

String+NLP.swift

extension String {
    func trimTrailingPunctuation() -> String {
        return self.trimmingCharacters(in: .whitespacesAndNewlines)
                    .trimmingCharacters(in: .punctuationCharacters)
                    .trimmingCharacters(in: .whitespacesAndNewlines)
    }
}

zoutput-example.txt

let example1 = "How are you???".trimTrailingPunctuation()
>>> How are you
let example2 = "Hi!!!!".trimTrailingPunctuation()
>>> Hi
let example3 = "Act limited time offer now!".trimTrailingPunctuation()
>>> Act limited time offer now