Validate password with regular expression

RegexPassword.java

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
*   Give true is all condition matches, otherwise false.
*   @param  String 
*   @return boolean
*/
private boolean validatePassword(String password){
    Pattern pattern = Pattern.compile("((?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%]).{6,20})");
    Matcher matcher = pattern.matcher(password); 
    return matcher.matches();
}