Posix Character Classes \p{Blank} ใน Java Regex

คลาสนี้ match tabs หรือ spaces ทั้งหมด

ตัวอย่าง 1

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

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

ผลลัพธ์

Enter a string space tab test
Number of blank characters: 2

ตัวอย่าง 2

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{Blank}.*$";
        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 blank characters: ");
        for (int i = 0; i < 5; i++) {
            Matcher m = p.matcher(input[i]);
            if (m.matches()) {
                System.out.println(m.group());
            }
        }
    }
}

ผลลัพธ์

Enter 5 input strings:
sample data
hello
welcome to tutorialspoint
12345
ab bc cd da
Strings with blank characters:
sample data
welcome to tutorialspoint
ab bc cd da