JSF - f:validateRegex


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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.No Attribute & Description
1

pattern

Formatting pattern

Example Application

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

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

JSF f:validateRegex

Enter an invalid value. Following will be the output.

JSF f:validateRegex1

Enter a valid value. Following will be the output.

JSF f:validateRegex2
jsf_validation_tags.htm

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