// uitextviewdelegate
    private var changedTextRange: NSRange! = nil
    private var replacementText: String! = nil

    func textViewDidChange(_ textView: UITextView) {
        UpdateTextViewSize()
        guard changedTextRange != nil, replacementText != nil else {
            return
        }
        autocomplete.didChangeText(range: changedTextRange, replacementText: replacementText)
        changedTextRange = nil
        replacementText = nil
    }

    func textViewDidChangeSelection(_ textView: UITextView) {
        if changedTextRange == nil {
            autocomplete.didChangeText(range: NSRange(location: textView.selectedRange.location, length: 0), replacementText: "")
        }
    }

    func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
        /* if invalid newstring then return before next code */

        changedTextRange = range
        replacementText = text

        return true
    }

// autocomplete
    var validInputStarted = false
    var stringRange: Range<Int>! = nil

    func didChangeText(range: NSRange, replacementText text: String) {
        let marker = "&" //
        var autoString = ""
        if validInputStarted {
            switch stringRange.lowerBound <= range.lowerBound && range.lowerBound <= stringRange.upperBound {
            case true:
                stringRange = stringRange.lowerBound..<(stringRange.upperBound + (text.count - range.length))
                autoString = String(Array(textView.text)[stringRange])

                if autoString.range(of: "^[a-z0-9]*(\\.[a-z0-9])*$", options: .regularExpression) == nil {
                    autoString = ""
                    fallthrough
                }
            default:
                validInputStarted = false
                stringRange = nil
                // clear()
                // очищаешь таблицу поиска и/или уничтожаешь еще
            }
        }
        if !validInputStarted, range.lowerBound + text.count - marker.count >= 0 && text.count > 0 {
            let markerRange = Range(range.lowerBound - marker.count + text.count..<range.lowerBound + text.count)
            if String(Array(textView.text)[markerRange]) == marker {
                stringRange = markerRange.lowerBound + marker.count..<markerRange.upperBound
                validInputStarted = true

                if let str = Optional((textView.text).suffix(textView.text.count - stringRange.lowerBound)),
                    let range = str.range(of: "^[a-z0-9]*(\\.[a-z0-9])*", options: .regularExpression) {

                    stringRange = NSRange(
                        location: stringRange.lowerBound,
                        length: str.distance(from: range.lowerBound, to: range.upperBound)
                    ).toRange()!
                    autoString = str.substring(with: range)
                    print(stringRange)
                }

                /* if (self.topConstraint?.isActive ?? true) == false { // show gui
                    UIView.animate(withDuration: 0.3, animations: {
                        self.topConstraint?.isActive = true
                        self.layoutIfNeeded()
                    })
                } */ // таблицу можешь показывать тут
            }
        }

        guard validInputStarted else {
            return
        }

        print(autoString) // готовая строка
        // делаешь запросы и отображаешь в таблице
        return;
    }