dduan

extension NSAttributedString {
    func replaceHTMLTag(tag: String, withAttributes attributes: [String: AnyObject]) -> NSAttributedString {
        let openTag = "<\(tag)>"
        let closeTag = "</\(tag)>"
        let resultingText: NSMutableAttributedString = self.mutableCopy() as NSMutableAttributedString
        while true {
            let plainString = resultingText.string as NSString
            let openTagRange = plainString.rangeOfString(openTag)
            if openTagRange.length == 0 {