জাভা রেজেক্সে POSIX ক্যারেক্টার ক্লাস \p{XDigit}

এই ক্লাস হেক্সাডেসিমাল ক্যারেক্টারগুলো ম্যাচ করে, অর্থাৎ [0-9a-fA-F]।

উদাহরণ ১

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class SpaceCharacters {
    public static void main(String args[]) {
        System.out.println("Enter a string");
        Scanner sc = new Scanner(System.in);
        String input = sc.nextLine();

        String regex = "[\\p{XDigit}]";

        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(input);
        int count = 0;
        while(matcher.find()) {
            count++;
        }
        System.out.println("Number of hexadecimal characters: " + count);
    }
}

আউটপুট

Enter a string Bb12\tc!
Number of hexadecimal characters: 5

উদাহরণ ২

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Example {
    public static void main(String args[]) {
        String regex = "^.*\\p{XDigit}.*$";

        Scanner sc = new Scanner(System.in);
        System.out.println("Enter 5 input strings: ");
        String input[] = new String[5];
        for (int i = 0; i < 5; i++) {
            input[i] = sc.nextLine();
        }

        Pattern p = Pattern.compile(regex);
        System.out.println("Strings with hexa decimal characters: ");
        for(int i = 0; i < 5; i++) {
            Matcher m = p.matcher(input[i]);
            if(m.matches()) {
                System.out.println(m.group());
            }
        }
    }
}

আউটপুট

Enter 5 input strings: sample 123 xyz @## DEF01
Strings with hexadecimal characters: sample 123 DEF01