IP地址正则表达式模式
^([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])$描述
^ #start of the line ( # start of group #1 [01]?\\d\\d? # Can be one or two digits. If three digits appear, it must start either 0 or 1 # e.g ([0-9], [0-9][0-9],[0-1][0-9][0-9]) | # ...or 2[0-4]\\d # start with 2, follow by 0-4 and end with any digit (2[0-4][0-9]) | # ...or 25[0-5] # start with 2, follow by 5 and ends with 0-5 (25[0-5]) ) # end of group #2 \. # follow by a dot "." .... # repeat with 3 times (3x) $ #end of the line整个组合表示从0到255的数字，后跟点“。”，重复4次并以点“。”结尾。 有效的IP地址格式为“ 0-255.0-255.0-255.0-255”。
package com.mkyong.regex; import java.util.regex.Matcher; import java.util.regex.Pattern; public class IPAddressValidator{ private Pattern pattern; private Matcher matcher; private static final String IPADDRESS_PATTERN = "^([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])$"; public IPAddressValidator(){ pattern = Pattern.compile(IPADDRESS_PATTERN); } /** * Validate ip address with regular expression * @param ip ip address for validation * @return true valid ip address, false invalid ip address */ public boolean validate(final String ip){ matcher = pattern.matcher(ip); return matcher.matches(); } } 1.“ 1.1.1.1”，“ 255.255.255.255”，“ 192.168.1.1”，
2.“ 10.10.1.1”，“ 132.254.111.10”，“ 26.10.2.10”，
3.“ 127.0.0.1”
1.“ 10.10.10” –必须为4“。”
2.“ 10.10” –必须为4“。”
3.“ 10” –必须为4“。”
4.“ aaaa” –仅允许数字
5.“ 10.0.0.a” –仅允许数字
6.“ 10.10.10.256” –数字必须介于[0-255]之间
7.“ 222.222.2.999” –数字必须介于[0-255]之间
8.“ 999.10.10.20” –数字必须介于[0-255]之间
9.“ 2222.22.22.22” –数字必须介于[0-255]之间
10.“ 22.2222.22.2” –数字必须介于[0-255]之间
package com.mkyong.regex; import org.testng.Assert; import org.testng.annotations.*; /** * IPAddress validator Testing * @author mkyong * */ public class IPAddressValidatorTest { private IPAddressValidator ipAddressValidator; @BeforeClass public void initData(){ ipAddressValidator = new IPAddressValidator(); } @DataProvider public Object[][] ValidIPAddressProvider() { return new Object[][]{ new Object[] {"1.1.1.1"},new Object[] {"255.255.255.255"}, new Object[] {"192.168.1.1"},new Object[] {"10.10.1.1"}, new Object[] {"132.254.111.10"},new Object[] {"26.10.2.10"}, new Object[] {"127.0.0.1"} }; } @DataProvider public Object[][] InvalidIPAddressProvider() { return new Object[][]{ new Object[] {"10.10.10"},new Object[] {"10.10"}, new Object[] {"10"},new Object[] {"a.a.a.a"}, new Object[] {"10.0.0.a"},new Object[] {"10.10.10.256"}, new Object[] {"222.222.2.999"},new Object[] {"999.10.10.20"}, new Object[] {"2222.22.22.22"},new Object[] {"22.2222.22.2"}, new Object[] {"10.10.10"},new Object[] {"10.10.10"}, }; } @Test(dataProvider = "ValidIPAddressProvider") public void ValidIPAddressTest(String ip) { boolean valid = ipAddressValidator.validate(ip); System.out.println("IPAddress is valid : " + ip + " , " + valid); Assert.assertEquals(true, valid); } @Test(dataProvider = "InvalidIPAddressProvider", dependsOnMethods="ValidIPAddressTest") public void InValidIPAddressTest(String ip) { boolean valid = ipAddressValidator.validate(ip); System.out.println("IPAddress is valid : " + ip + " , " + valid); Assert.assertEquals(false, valid); } }IPAddress is valid : 1.1.1.1 , true IPAddress is valid : 255.255.255.255 , true IPAddress is valid : 192.168.1.1 , true IPAddress is valid : 10.10.1.1 , true IPAddress is valid : 132.254.111.10 , true IPAddress is valid : 26.10.2.10 , true IPAddress is valid : 127.0.0.1 , true IPAddress is valid : 10.10.10 , false IPAddress is valid : 10.10 , false IPAddress is valid : 10 , false IPAddress is valid : a.a.a.a , false IPAddress is valid : 10.0.0.a , false IPAddress is valid : 10.10.10.256 , false IPAddress is valid : 222.222.2.999 , false IPAddress is valid : 999.10.10.20 , false IPAddress is valid : 2222.22.22.22 , false IPAddress is valid : 22.2222.22.2 , false PASSED: ValidIPAddressTest([Ljava.lang.String;@1d4c61c) PASSED: InValidIPAddressTest([Ljava.lang.String;@116471f) =============================================== com.mkyong.regex.IPAddressValidatorTest Tests run: 2, Failures: 0, Skips: 0 =============================================== =============================================== mkyong Total tests run: 2, Failures: 0, Skips: 0 ===============================================
翻译自: https://mkyong.com/regular-expressions/how-to-validate-ip-address-with-regular-expression/