Regex HackerRank Solution

The problem context involves validating IP addresses. An IP address is a string in the form of 'A.B.C.D', where the value of A, B, C, and D may range from 0 to 255. The task is to write a Java program that validates whether a given string is a valid IP address or not.

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Here is the Regex HackerRank Solution HackerRank solution using CodeRankGPT:

The solution approach involves using regular expressions. A static string 'zeroTo255' is defined to match any number from 0 to 255. This is then used to construct the pattern for a valid IP address. In the main method, the program reads a string and checks if it matches the defined pattern, thus validating if it is a valid IP address or not.


/**
 * 
 */
package com.javaaid.hackerrank.solutions.languages.java.strings;

import java.util.Scanner;

/**
 *
 */
class MyRegex {
	static String zeroTo255 = "(\\d{1,2}|(0|1)\\d{2}|2[0-4]\\d|25[0-5])";
	public static String pattern = zeroTo255 + "\\." + zeroTo255 + "\\." + zeroTo255 + "\\." + zeroTo255;

}

public class JavaRegex {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		while (in.hasNext()) {
			String IP = in.next();
			System.out.println(IP.matches(new MyRegex().pattern));
		}
		in.close();
	}
}

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