Unescape HTML entities in Swift 3 == £ -> £

String+HTML.swift

extension String {
    
    func unescapeHTMLEntities() throws -> String {
        
        guard contains("&#") else {
            return self
        }
        
        guard let data = data(using: .utf8) else {
            return self
        }
        
        let attributes: [String: Any] = [
            NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,
            NSCharacterEncodingDocumentAttribute: String.Encoding.utf8
        ]
        
        let attributedString = try NSAttributedString(
            data: data,
            options: attributes,
            documentAttributes: nil
        )
        
        return attributedString.string
        
    }
    
}

"£100".unescapeHTMLEntities() // £100