一、驗證郵箱是否正確

public class ForTest {

public static void main(String[] args) {

System.out.println("123");

String email = "[email protected]";

//boolean ss = email.matches("^[\\w-]+(\\.[\\w-]+)*@[\\w-]+(\\.[\\w-]+)+$");

System.out.print(email.matches("^[\\w-]+(\\.[\\w-]+)*@[\\w-]+(\\.[\\w-]+)+$"));

}

}

二、驗證密碼的開始或結尾不能為空格

密碼的結束不能為空格：password.matches(".*\\s+$")

三、判斷給出的日期是否合法

import java.util.regex.Pattern;

public class ForTest {

public static void main(String[] args) {

Pattern pattern = Pattern.compile("^((\\d{2}(([02468][048])|([13579][26]))[\\-\\/\\s]?((((0?[13578])|(1[02]))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])))))|(\\d{2}(([02468][1235679])|([13579][01345789]))[\\-\\/\\s]?((((0?[13578])|(1[02]))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\\-\\/\\s]?((0?[1-9])|(1[0-9])|(2[0-8]))))))(\\s(((0?[0-9])|([1-2][0-3]))\\:([0-5]?[0-9])((\\s)|(\\:([0-5]?[0-9])))))?$");

Matcher matcher = pattern.matcher("2015-04-30 23:59:59");

System.out.println(matcher.matches());

}

}

四、驗證IP地址是否合法：255.255.255.255

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class ForTest {

public static void main(String[] args) {

Pattern pattern1 = Pattern.compile("\\b((?!\\d\\d\\d)\\d+|1\\d\\d|2[0-4]\\d|25[0-5])\\.((?!\\d\\d\\d)\\d+|1\\d\\d|2[0-4]\\d|25[0-5])\\.((?!\\d\\d\\d)\\d+|1\\d\\d|2[0-4]\\d|25[0-5])\\.((?!\\d\\d\\d)\\d+|1\\d\\d|2[0-4]\\d|25[0-5])\\b");

Matcher matcher1 = pattern1.matcher("127.400.600.2"); //以驗證127.400.600.2為例

System.out.println(matcher1.matches());

}

}