viewModel

class Textbox {
    constructor(selector, regex) {
        this._value = '';
        this._elements = document.querySelectorAll(selector);
        this._invalidSymbols = regex;
        Array.from(this._elements).forEach((el) =>
            el.addEventListener('change', () => {
                this.value = el.value;
            })
        );
    }

    get value() {
        return this._value;
    }

    set value(v) {
        Array.from(this._elements).forEach((x) => (x.value = v));
        this._value = v;
    }

    get elements() {
        return this._elements;
    }

    isValid() {

        return !this._invalidSymbols.test(this.value);
    }
}