US Zip Codes: /(^\d{5}$)|(^\d{5}-\d{4}$)/
var isValidZip = /(^\d{5}$)|(^\d{5}-\d{4}$)/.test("90210");
JavaScript
ZIP Code (US Postal Code) validation with Javascript
US Zip Codes: /(^\d{5}$)|(^\d{5}-\d{4}$)/
var isValidZip = /(^\d{5}$)|(^\d{5}-\d{4}$)/.test("90210");