আপনি মেটা অক্ষর "\\D" ব্যবহার করে অ-অঙ্কের অক্ষর মেলাতে পারেন৷ .
উদাহরণ 1
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String args[]) { //Reading String from user System.out.println("Enter a String"); Scanner sc = new Scanner(System.in); String input = sc.nextLine(); String regex = "\\D"; //Compiling the regular expression Pattern pattern = Pattern.compile(regex); //Retrieving the matcher object Matcher matcher = pattern.matcher(input); int count = 0; while(matcher.find()) { count++; } System.out.println("Number non-digit characters: "+count); } }
আউটপুট
Enter a String sample text 2425 36 Number non-digit characters: 13
উদাহরণ 2
import java.util.Scanner; public class RegexExample { public static void main( String args[] ) { //regular expression to accept 5 letter word String regex = "\\D{10}"; System.out.println("Enter input value: "); Scanner sc = new Scanner(System.in); String input = sc.nextLine(); boolean result = input.matches(regex); if(result) { System.out.println("input matched"); } else { System.out.println("wrong input"); } } }
আউটপুট 1
Enter input value: sample abc input matched
আউটপুট 2
Enter input value: sample1234 wrong input