21. Java Regex - String | Java | Hackerrank

Problem Statement :
Write a class called MyRegex which will contain a string pattern. You need to write a regular expression and assign it to the pattern such that it can be used to validate an IP address.

[chiragsharma]

the solution is
class MyRegex {
String num =
String pattern = num+'.'num+'.'num+'.'num; }
Explanation as
Targets
1----> IP address should be 0-255;

2----> it should contain only digits;

3----> should not exceed 3 digit number i.e (255);

Approach:

1--> it can contain single digit i.e ([0-9]);

2--> It can contain two digits i.e ([0-9][0-9]);

3--> Range is (099 to 199)i.e((0|1)[0-9][0-9]);

4--> range is (200 - 249) i.e (2[0-9][0-9]) ;

5--> range is (250-255) i.e (25[0-5]);
Total :

[gauravkhubchandani]

jo samjhana tha vo copy paste mar kr run kr dia, kha se aa jate h ase log....!

[ytuser]

Bro you failed to explain the regular expression

[rubenalbertassi]

Muito bom, estou com uma duvida quando se uma vírgula, se eu tiver um valor com, (vírgula) exemplo 124, 56 como ficaria?

[pradiptachatterjee]

can explain about the regular expression you used in your code to solve this problem