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My earlier post on how to validate email address, SSN and phone number validation using Java regex still attracts lot of visitors. Today I realized that another piece of data that many programmers need to validate is the date. Many Java applications have to process input date values, so I thought it will be beneficial to this blog readers to show how regular expression can be used to validate date in java.

First I’ll show you how to validate date using java reg ex in US format and later I’ll show you how that same logic can be applied to validate date in English format (used in most countries outside North America).
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One of the routine tasks in many Java applications is to convert a string to a number. For instance, you may have a form where user submits his or her age. The input will come to your Java application as a String but if you need the age to do some calculation you need to convert that String into a number.
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My post about Java regular expression gets a lot of hits daily. Someone commented that the regular expression I included in that post does not block certain invalid email addresses. So I updated the Java regular expression to validate email address. I am pretty sure that the following Java regular expression will validate any email address.

"^[\\w\\-]([\\.\\w])+[\\w]+@([\\w\\-]+\\.)+[A-Z]{2,4}$";

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Regular expressions provide a powerful and flexible way to search for phrases or characters but they are also confusing and many developers find them quite daunting. If you have been reluctant to learn regular expressions because of their apparent complexity, fear no more. More

Continuing with our JavaScript regular expression series today we will discuss JavaScript regular expression to validate U.S phone number. Previously we talked about validating email , Social Security number and zip code using JS regex.

In today’s post I’ll show you how to use JavaScript regular expression to validate U.S phone number.

Although in this article we are discussing U.S phone number format I am sure this can be applied to other phone number formats with little or no change.

Let’s begin by looking at the JavaScript code.

function validatePhoneNumber(elementValue){
var phoneNumberPattern = /^\(?(\d{3})\)?[- ]?(\d{3})[- ]?(\d{4})$/;
return phoneNumberPattern.test(elementValue);
}

Explanation:

The argument to this method is the phone number you want to validate.

In the method body we define a variable (‘phoneNumberPattern’) and assign a regular expression to it.

Phone Number format: The regular expression for phone number is More

Continuing with my series of JavaScript regular expression today we will see how easy it is to validate zip code using regular expression in JavaScript. Previously we talked about validating email and Social Security number using JS regex.

In today’s post I’ll show you how to use JavaScript regular expression to validate zip code. Let me first show you the JS code.

function validateZipCode(elementValue){
    var zipCodePattern = /^\d{5}$|^\d{5}-\d{4}$/;
     return zipCodePattern.test(elementValue);
}

Explanation:

The argument to this method is the zip code you want to validate.

In the method body we define a variable (‘zipCodePattern’) and assign a regular expression to it.

ZipCode format: The regular expression for zip code is

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Regular Expressions offer a concise and powerful search-and-replace mechanism.
They are patterns of characters used to perform search, extract or replace operations on the given text. Regular expressions can also be used to validate that the input conforms to a given format.

For example, we can use Regular Expression to check whether the user input is a valid Social Security number, a valid phone number or a valid email number, etc.
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