How to put a function in a balloon template?

Question

JavaScript

var Custom = ymaps.templateLayoutFactory.createClass(
                '<div>' +
                    '<a href="tel:{{properties.phone}}">{{properties.phone}}</a>' + +
                '</div>'
            );

How to put properties.phone with a regular expression in a link?

Answer 1

var Custom = ymaps.templateLayoutFactory.createClass(
                '<div>' +
                    '<a href="tel:' + properties.phone + '">' + properties.phone +'</a>' +
                '</div>'
            );

Template String Syntax

var Custom = ymaps.templateLayoutFactory.createClass(
                '<div>' +
                    `<a href="tel:${properties.phone}">${properties.phone}</a>` +
                '</div>'
            );