자바 정규식(비밀번호, 이메일, 아이피주소)

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import java.util.regex.Matcher; import java.util.regex.Pattern;    public class RegexTest1{       private Pattern pattern;    private Matcher matcher;      public RegexTest1(String pattern){     this.pattern = Pattern.compile(pattern);    }         public boolean validate(String text){           matcher = pattern.matcher(text);     return matcher.matches();                }         public static void main(String [] args){           String passwordPattern = "((?=.*\\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%]).{6,20})";           String emailPattern = "^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@"      + "[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$";       String ipaddressPattern = "^([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\."                + "([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.([01]?\\d\\d?|2[0-4]\\d|25[0-5])$";                 RegexTest1 password = new RegexTest1(passwordPattern);     RegexTest1 email = new RegexTest1(emailPattern);     RegexTest1 ipaddress = new RegexTest1(ipaddressPattern);           String text1 = "aaSS12!@";     String text2 = "ASsdv221@nate.com";     String text3 = "127.1.1.1";           System.out.println(password.validate(text1) + "\t" + text1);     System.out.println(email.validate(text2) + "\t" + text2);     System.out.println(ipaddress.validate(text3) + "\t" + text3);           text1 = "aaS!@";     text2 = "ASsdv221@natecom";     text3 = "0127.1.1.1";           System.out.println(password.validate(text1) + "\t" + text1);     System.out.println(email.validate(text2) + "\t" + text2);     System.out.println(ipaddress.validate(text3) + "\t" + text3);    }           }