Shulou(Shulou.com)06/02 Report--

How do you sort IP using regular expressions? Many novices are not very clear about this. In order to help you solve this problem, the following editor will explain it in detail. People with this need can come and learn. I hope you can gain something.

1. Zeros are added so that comparisons can be made in the order of strings.

2. Intercept and reserve the last three bits (the maximum number of ip addresses is 3 digits).

3. Use the Arrays.sort () method to sort the intercepted strings.

4. Remove the excess 0 and return to the original ip.

5. Implementation code:

Package IPSort;import java.util.Arrays;/** * sorts IP using regular expressions in four steps: * @ author tiger * * / public class IPSortTest {public static void main (String [] args) {String [] ips = {"10.2.4.23", "192.168.1.2", "173.68.46.65", "191.158.6.2", "9.2.4.23"} System.out.println ("- 1, zero padding -"); for (int I = 0; I < ips.length; iTunes +) {ips [I] = IPS [I] .replaceAll ("(\\ d +)", "00 $1"); System.out.println (IPs [I]);} System.out.println ("- 2, intercept -"); for (int I = 0; I < ips.length) System.out.println +) {ips [I] = IPS [I] .replaceAll ("0 * (\ d {3})", "$1"); System.out.println (IPs [I]);} System.out.println ("- 3, sort -"); Arrays.sort (ips); for (int I = 0; I < replaceAll) {System.out.println (IPS [I]) } System.out.println ("- 4, zero -"); for (int I = 0; I < ips.length; iTunes +) {ips [I] = IPS [I] .replaceAll ("0 * (\ d +)", "$1"); System.out.println (IPS [I]);}

6. Running result:

-original IP address-10.2.4.23192.168.1.2173.68.46.65191.158.6.29.2.4.23-1, plus zero Compare in string order-0010.002.004.002300192.00168.001.00200173.0068.0046.006500191.00158.006.002009.002.004.0023-2, intercept Keep three digits-010.002.004.023192.168.001.002173.068.046.065191.158.006.002009.002.004.004.002.004.0233.068.046.0651.158.006.002192.168.001.002-4, Go to zero-9.2.4.2310.2.4.23173.68.46.65191.158.2192.168.1.2 is it helpful for you to read the above content? If you want to know more about the relevant knowledge or read more related articles, please follow the industry information channel, thank you for your support.

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