Regex for validate cellphones numbers from Paraguay

cellphonepy.js

// Jquery Validator
$.validator.addMethod('phonePY', function(phone_number, element) {
    var regex = /^((\+595|0)9([6-9][1-6])\d{6})$/;
    return this.optional(element) || phone_number.length <= 13 && regex.test(phone_number);
}, 'Please write a valid cell phone number.');