Posix Character Classes \p{Lower} ใน Java Regex

คลาสนี้ match ตัวอักษรพิมพ์เล็ก (Lowercase alphabetic characters) คือ a-z

ตัวอย่าง 1

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

public class Posix_LowerExample {
    public static void main(String args[]) {
        String regex = "^\\p{Lower}+$";
        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 lower case letters: ");
        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:
Raju
RAMU
rahman
radha
SUnDar*
Strings with lower case letters:
rahman
radha

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[]) {
        System.out.println("Enter a string");
        Scanner sc = new Scanner(System.in);
        String input = sc.nextLine();
        String regex = "\\p{Lower}";
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(input);
        int count = 0;
        while (matcher.find()) {
            count++;
        }
        System.out.println("Number of lower case letters in given string: " + count);
    }
}

Output 1

Enter a string Hello How Are You
Number of lower case letters in given string: 10

Output 2

Enter a string WELCOME TO TUTORILASPOINT
Number of lower case letters in given string: 0