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How to use Java RegEx to match equivalent non-whitespace?

You can use the meta-character “ \\S ”to match non-space characters.

Example

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
   public static void main(String args[]) {
      //Read string from user
      System.out.println("Enter a String");
      Scanner sc = new Scanner(System.in);
      String input = sc.nextLine();
      String regex = "\\S";
      //Compile regular expression
      Pattern pattern = Pattern.compile(regex);
      //Retrieve matcher object
      Matcher matcher = pattern.matcher(input);
      int count = 0;
      while(matcher.find()) {
         count++;
      }
      System.out.println("Number of characters (not spaces): " );+count);
   }
}

Output Result

Enter a String
Hello how are you welcome to w3codebox
Number of characters (not spaces): 37