Bạn có thể đối sánh các ký tự không phải khoảng trắng bằng ký tự meta " \\ S ".
Ví dụ
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 = "\\S"; //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 of characters (not spaces): "+count); } }
Đầu ra
Enter a String Hello how are you welcome to tutorialspoint Number of characters (not spaces): 37