How to match a non-white space equivalent using Java RegEx?

You can match the non-white space characters using the meta character "\\S".

Example

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);
   }
}

Output

Enter a String
Hello how are you welcome to tutorialspoint
Number of characters (not spaces): 37