JSF - f:validateRegex

Advertisements


f:validateRegex tag is used to validate a string value to a required format.

JSF Tag

<f:validateRegex pattern="((?=.*[a-z]).{6,})" />

Tag Attributes

S.N.Attribute & Description
1pattern
Formatting pattern

Example Application

Let us create a test JSF application to test the above tag.

StepDescription
1Create a project with a name helloworld under a package com.tutorialspoint.test as explained in the JSF - First Application chapter.
2Modify home.xhtml as explained below. Keep rest of the files unchanged.
3Create result.xhtml in the webapps directory as explained below.
4Create UserData.java as a managed bean under package com.tutorialspoint.test as explained below.
5Compile and run the application to make sure business logic is working as per the requirements.
6Finally, build the application in the form of war file and deploy it in Apache Tomcat Webserver.
7Launch your web application using appropriate URL as explained below in the last step.

UserData.java

package com.tutorialspoint.test;

import java.io.Serializable;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;

@ManagedBean(name = "userData", eager = true)
@SessionScoped
public class UserData implements Serializable {

   private static final long serialVersionUID = 1L;

   private String password;
   public String getPassword() {
      return password;
   }
   public void setPassword(String password) {
      this.password = password;
   }   
}

home.xhtml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"   
   xmlns:h="http://java.sun.com/jsf/html"
   xmlns:f="http://java.sun.com/jsf/core">
   <h:head>
      <title>JSF tutorial</title>			
   </h:head>
   <h:body>    
   <h2>h:validateRegex Example</h2>
   <!-- password contains lower case letters only and.
   length of the password should be greater than 6. -->
   <h:form>
      <h:inputSecret id="passwordInput" value="#{userData.password}" 
         label="password" >
         <f:validateRegex pattern="((?=.*[a-z]).{6,})" />
      </h:inputSecret>			
      <h:commandButton value="submit" action="result"/>
      <h:message for="passwordInput" style="color:red" />
   </h:form>
</h:body>
</html>

result.xhtml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
   xmlns:f="http://java.sun.com/jsf/core"    
   xmlns:h="http://java.sun.com/jsf/html">
   <h:head>
      <title>JSF Tutorial!</title>   
   </h:head>
   <h:body>
      <h2>Result</h2>
      <hr />     
      Password: #{userData.password}     
   </h:body>
</html>  

Once you are ready with all the changes done, let us compile and run the application as we did in JSF - First Application chapter. If everything is fine with your application, this will produce following result:

JSF f:validateRegex

Enter an invalid value

JSF f:validateRegex1

Enter a valid value

JSF f:validateRegex2

Advertisements
Advertisements