extension NSMutableAttributedString {
    func apply(attribute: [NSAttributedString.Key: Any], subString: String)  {
        if let range = self.string.range(of: subString) {
            self.apply(attribute: attribute, onRange: NSRange(range, in: self.string))
        }
    }
    func apply(attribute: [NSAttributedString.Key: Any], onRange range: NSRange) {
        if range.location != NSNotFound {
            self.setAttributes(attribute, range: range)
        }
    }
}