Issue #820

Use NSDataDetector to detect links, and NSMutableAttributedString to mark link range. Then we enumerateAttributes and build our Text

func attribute(string: String) -> Text {
    guard let detector = try? NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue)
    else {
        return Text(string)
    }

    let stringRange = NSRange(location: 0, length: string.count)

    let matches = detector.matches(
        in: string,
        options: [],
        range: stringRange
    )

    let attributedString = NSMutableAttributedString(string: string)
    for match in matches {
        attributedString.addAttribute(.underlineStyle, value: NSUnderlineStyle.single, range: match.range)
    }

    var text = Text("")
    attributedString.enumerateAttributes(in: stringRange, options: []) { attrs, range, _ in
        var t = Text(attributedString.attributedSubstring(from: range).string)
        if attrs[.underlineStyle] != nil {
            t = t
                .foregroundColor(.gray)
                .underline()
        } else {
            t = t
                .foregroundColor(Color(UIColor.label))
        }

        text = text + t
    }

    return text
}

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