[Solved] How can I append value if NSAttributedstring contains external link?

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Here what you could do:
Enumerate the link attribute.
Check for each value if it’s the one you want (the one that starts with “applewebdata://”).
Modify either the rest of the string and/or the link (your question is unclear on that part, I made both).

attributedString needs to be mutable (NSMutableAttributedString).

attributedString.enumerateAttribute(.link, in: NSRange(location: 0, length: attributedString.length), options: [.reverse]) { (attribute, range, pointee) in
    if let link = attribute as? URL, link.absoluteString.hasPrefix("applewebdata://") {
        var replacement = NSMutableAttributedString(attributedString: attributedString.attributedSubstring(from: range))

        //Use replaceCharacters(in range: NSRange, with str: String) if you want to keep the same "effects" (attributes)
        replacement.replaceCharacters(in: NSRange(location: replacement.length, length: 0), with: "~~>")

        //Change the link if needed
        let newLink = link.absoluteString + "2"
        replacement.addAttribute(.link, value: newLink, range: NSRange(location: 0, length: replacement.length))

        //Replace
        attributedString.replaceCharacters(in: range, with: replacement)
    }
}

Code for Playground to put before if needed:

let htmlString = "Hello this <a href=\"http://stackoverflow.com\">external link</a> and that's an <a href=\"applewebdata://myInternalLink\">internal link</a> and that's it."
let htmlData = htmlString.data(using: .utf8)!
let attributedString = try! NSMutableAttributedString(data: htmlData,
                                                      options: [.documentType : NSAttributedString.DocumentType.html],
                                                      documentAttributes: nil)

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solved How can I append value if NSAttributedstring contains external link?