How to use regular expressions in Java

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I am developing applications in Java and i use Eclipse platform to built applications in Java.

i created a form, registration form for my application and i want to apply form validation technique on that registration form. While I developing application in C# I use Regular Expressions and I don’t know how to do this in Java.

My registration Form is shown below.

Can anyone help me to solve this problem.



Answered By 0 points N/A #117895

How to use regular expressions in Java


Java has support in regular expression through java.util.regex package. And you need to compile your regular expression through Pattern.compile () class factory. There is also a Matcher class that interprets the pattern and execute match operations.

Sample code:

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class RegexMatcher


    public static void main (String args[])


         String email_ad = “[email protected]”;

         String reg_ex = “@{1}”; \ look for a @ symbol in email_ad and only one

         // create pattern object to compile regex

         Pattern pattern = Pattern.compile(reg_ex);

          // create matcher object to perform matching on the pattern set

       Matcher matcher = pattern.matcher(email_ad);

         if (matcher.find())


            System.out.println(“Email ad verified.”);




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