JSFiddle - React, Tailwind, and code Playground

by Jorgelig

HTML

<script src="https://raw.github.com/ericmbarnard/Knockout-Validation/master/Src/knockout.validation.js"></script>
<input data-bind="value: ContactPhone">

JavaScript

ko.validation.init();

function VM() {
    var self = this;
    self.ContactPhone = ko.observable().extend({
        required: true,
        pattern: {
            message: 'Invalid phone number.',
            params: /^\D?(\d{3})\D?\D?(\d{3})\D?(\d{4})$/
        }
    });
}

ko.applyBindings(window.v=new VM());