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How to write a regex to validate the password | Regex in java |
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
*
* How to validate password with regular expression
*
*/
public class PasswordValidator
{
private Pattern pattern;
private Matcher matcher;
private static final String PASSWORD_REGEX =
"((?=.*\\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%]).{6,20})";
public PasswordValidator()
{
pattern = Pattern.compile(PASSWORD_REGEX);
}
/**
* Validate password with regular expression
*
* @param password password for validation
* @return true valid password, false invalid password
*/
public boolean validate(final String password)
{
matcher = pattern.matcher(password);
return matcher.matches();
}
}
import java.util.regex.Pattern;
/**
*
* How to validate password with regular expression
*
*/
public class PasswordValidator
{
private Pattern pattern;
private Matcher matcher;
private static final String PASSWORD_REGEX =
"((?=.*\\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%]).{6,20})";
public PasswordValidator()
{
pattern = Pattern.compile(PASSWORD_REGEX);
}
/**
* Validate password with regular expression
*
* @param password password for validation
* @return true valid password, false invalid password
*/
public boolean validate(final String password)
{
matcher = pattern.matcher(password);
return matcher.matches();
}
}
RegexDemo.java
/**
*
* How to validate password with regular expression
*
*/
public class RegexDemo
{
public static void main(String[] args)
{
PasswordValidator passwordValidator = new PasswordValidator();
System.out.println("'peter1AB@' is valid? = "+passwordValidator.validate("peter1AB@"));
System.out.println("'peter4COW$' is valid? = "+passwordValidator.validate("peter4COW$"));
System.out.println("'peter78Dog%#' is valid? = "+passwordValidator.validate("peter78Dog%#"));
System.out.println("--------------------------------------------------");
/*
* too short, minimum 6 characters
*/
System.out.println("'p1AB@' is valid? = "+passwordValidator.validate("p1AB@"));
/*
* uppercase characters is required
*/
System.out.println("'peter1@' is valid? = "+passwordValidator.validate("peter1@"));
/*
* special symbol “*" is not allow here
*/
System.out.println("'peterAB2*' is valid? = "+passwordValidator.validate("peterAB2*"));
/*
* digit is required
*/
System.out.println("'peterAB$' is valid? = "+passwordValidator.validate("peterAB$"));
/*
* lower case character is required
*/
System.out.println("'PETER2$' is valid? = "+passwordValidator.validate("PETER2$"));
}
}
*
* How to validate password with regular expression
*
*/
public class RegexDemo
{
public static void main(String[] args)
{
PasswordValidator passwordValidator = new PasswordValidator();
System.out.println("'peter1AB@' is valid? = "+passwordValidator.validate("peter1AB@"));
System.out.println("'peter4COW$' is valid? = "+passwordValidator.validate("peter4COW$"));
System.out.println("'peter78Dog%#' is valid? = "+passwordValidator.validate("peter78Dog%#"));
System.out.println("--------------------------------------------------");
/*
* too short, minimum 6 characters
*/
System.out.println("'p1AB@' is valid? = "+passwordValidator.validate("p1AB@"));
/*
* uppercase characters is required
*/
System.out.println("'peter1@' is valid? = "+passwordValidator.validate("peter1@"));
/*
* special symbol “*" is not allow here
*/
System.out.println("'peterAB2*' is valid? = "+passwordValidator.validate("peterAB2*"));
/*
* digit is required
*/
System.out.println("'peterAB$' is valid? = "+passwordValidator.validate("peterAB$"));
/*
* lower case character is required
*/
System.out.println("'PETER2$' is valid? = "+passwordValidator.validate("PETER2$"));
}
}
Output
'peter1AB@' is valid? = true
'peter4COW$' is valid? = true
'peter78Dog%#' is valid? = true
--------------------------------------------------
'p1AB@' is valid? = false
'peter1@' is valid? = false
'peterAB2*' is valid? = false
'peterAB$' is valid? = false
'PETER2$' is valid? = false
'peter4COW$' is valid? = true
'peter78Dog%#' is valid? = true
--------------------------------------------------
'p1AB@' is valid? = false
'peter1@' is valid? = false
'peterAB2*' is valid? = false
'peterAB$' is valid? = false
'PETER2$' is valid? = false
Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/RegexDemo_password.zip?attredirects=0&d=1
Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/RegexDemo_password
Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/576579fab6c376d5ecd7cb5b7402b7fd1a7c4ae3/BasicJava/RegexDemo_password/?at=master
See also:
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