(Swift 3,4,5...) Decode 2-digit Hex Escaped

Demonstrates how to replace escaped us-ascii chars such as \x7b and \x22 with the chars.

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func chilkatTest() {
    // We have the following string with some us-ascii chars escaped like this:
    var s: String? = "\x7b\x22responseContext\x22:\x7b\x22"

    // Note: The above escaping does not conform to any standard format (as far as I know).
    // Chilkat does not have anything to decode from the above.
    // However, we can 1st transform into a standard format, and then decode..

    // JSON escapes chars outside us-ascii like this:  "Hello, \ud83d\ude03!"
    // We can transform the above to this:  "\u007b\u0022responseContext\u0022:\u007b\u0022"
    // And then decode..

    let sb = CkoStringBuilder()!

    sb.append(s)
    var numReplaced: Int = sb.replace("\\x", replacement: "\\u00").intValue

    // Now decode from "json" escapes
    sb.decode("json", charset: "utf-8")

    // Show the decoded string
    print("\(sb.getAsString()!)")

    // Here's the result: {"responseContext":{"

}