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JSF - f:validateRegex
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.
Enter an invalid value. Following will be the output.
Enter a valid value. Following will be the output.
jsf_validation_tags.htm
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