phone number validation

validate_phone.js

function validate(phone) {
    var regex = /^\+(?:[0-9]?){6,14}[0-9]$/;

    if (regex.test(phone)) {
        // Valid international phone number
        return 'valid'
    } else {
        return 'invalid'
        // Invalid international phone number
    }
}

phone = '+9779805779427'

console.log(validate(phone))