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How to use Java RegEx to match non-word characters?

except English letters (both uppercase and lowercase) and numbers (0 to9All characters except word characters are considered non-word characters. You can use the metacharacter "\W" to match them.

Example1

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
   public static void main(String args[]) {
      //Read a string from the user
      System.out.println("Enter a String");
      Scanner sc = new Scanner(System.in);
      String input = sc.nextLine();
      String regex = "^\\W{5";
      //Compile regular expression
      Pattern pattern = Pattern.compile(regex);
      //Retrieve matcher object
      Matcher matcher = pattern.matcher(input);
      if(matcher.find()) {
         System.out.println("Match occurred");
      } else {
         System.out.println("Match not occurred");
      }
   }
}

Output1

Enter a String
*&&^#
Match occurred

Output2

Enter a String
hello
Match not occurred

Example2

import java.util.Scanner;
public class RegexExample {
   public static void main(String args[]) {
      String regex = "\\W*";
      System.out.println("Enter input value:");
      Scanner sc = new Scanner(System.in);
      String input = sc.nextLine();
      boolean bool = input.matches(regex);
      if(bool) {
         System.out.println("match occurred");
      } else {
         System.out.println("match not occurred");
      }
   }
}

Output Result

Enter input value:
#***
match occurred