Password Regular Expression Pattern
((?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%]).{6,20})
Description
( #Start of group
(?=.*\d) #must contains one digit from 0-9
(?=.*[a-z]) # must contains one lowercase characters
(?=.*[A-Z] #must contains one uppercase characters
(?=.*[@#$%]) # must contains one special symbols in the list "@#$%"
. #match anything with previous condition checking
{6,20} # length at least 6 characters and maximum of 20
) #End of group
Code :
package com.codewr.javacore.regular.expression;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
*
* @author codewr
*/
public class PasswordValidator {
/**
* ( Start of group
* (?=.*\d) must contains one digit from 0-9
* (?=.*[a-z]) must contains one lowercase characters
* (?=.*[A-Z] must contains one uppercase characters
* (?=.*[@#$%]) must contains one special symbols in the list "@#$%"
* . match anything with previous condition checking
* {6,20} length at least 6 characters and maximum of 20
* ) End of group
*/
private static final String PASSWORD_PATTERN = "((?=.*\\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%]).{6,20})";
public static void main(String[] args) {
PasswordValidator passwordValidator = new PasswordValidator();
//check password validate
boolean isValid = passwordValidator.validate("codewr12");
System.out.println("password valid is " + isValid);
}
/**
* Validate password with regular expression
*
* @param password password for validation
* @return true valid password, false invalid password
*/
public boolean validate(final String password) {
Pattern pattern = Pattern.compile(PASSWORD_PATTERN);
Matcher matcher = pattern.matcher(password);
return matcher.matches();
}
}
Code UnitTest:
- [email protected], codeWR12$: valid password
- [email protected]: invalid because too short , min 6 characters
- [email protected]: invalid because uppercase characters is required
- codeWr12* : invalid because symbol “*” is not allow
- [email protected]: invalid because digit is required
- CODEWR12$: invalid because lowercase characters is required
- [email protected]: invalid because too long, max 20 characters
import com.codewr.javacore.regular.expression.PasswordValidator;
import org.testng.Assert;
import org.testng.annotations.*;
/**
* Password validator Testing
* @author codewr
*
*/
public class PasswordValidatorTest {
private PasswordValidator passwordValidator;
@BeforeClass
public void initData(){
passwordValidator = new PasswordValidator();
}
@DataProvider
public Object[][] ValidPasswordProvider() {
return new Object[][]{
{new String[] {
"[email protected]", "codeWR12$"
}}
};
}
@DataProvider
public Object[][] InvalidPasswordProvider() {
return new Object[][]{
{new String[] {
"[email protected]","[email protected]","codeWr12*",
"[email protected]","CODEWR12$","[email protected]"
}}
};
}
@Test(dataProvider = "ValidPasswordProvider")
public void ValidPasswordTest(String[] password) {
for(String temp : password){
boolean valid = passwordValidator.validate(temp);
System.out.println("Password is valid : " + temp + " , " + valid);
Assert.assertEquals(true, valid);
}
}
@Test(dataProvider = "InvalidPasswordProvider",
dependsOnMethods="ValidPasswordTest")
public void InValidPasswordTest(String[] password) {
for(String temp : password){
boolean valid = passwordValidator.validate(temp);
System.out.println("Password is valid : " + temp + " , " + valid);
Assert.assertEquals(false, valid);
}
}
}
Output:
Running PasswordValidatorTest
Password is valid : [email protected] , true
Password is valid : codeWR12$ , true
Password is valid : [email protected] , false
Password is valid : [email protected] , false
Password is valid : codeWr12* , false
Password is valid : [email protected] , false
Password is valid : CODEWR12$ , false
Password is valid : [email protected] , false
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.406 sec
Results :
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0
Note: file pom.xml add maven
<dependency>
<groupId>org.testng</groupId>
<artifactId>testng</artifactId>
<version>6.8</version>
<scope>test</scope>
</dependency>