Explain Regular Expression "w" Metacharacter in Java

The subexpression/metacharacter “\w” matches the word characters i.e. a to z and A to Z and 0 to 9.

Example 1

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RegexExample {
   public static void main( String args[] ) {
      String regex = "\w to";
      String input = "Hello how are you welcome to Tutorialspoint";
      Pattern p = Pattern.compile(regex);
      Matcher m = p.matcher(input);
      int count = 0;
      while(m.find()) {
         count++;
      }
      System.out.println("Number of matches: "+count);
   }
}

Output

Number of matches: 1

Example 2

Following example reads 5 string values and prints those that contain word characters −

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MatchWordCharacters {
   public static void main( String args[] ) {
      String regex = "\w.*$";
      Scanner sc = new Scanner(System.in);
      System.out.println("Enter 5 input strings: ");
      String input[] = new String[5];
      for (int i=0; i
Output
Enter 5 input strings:
sample
test
test23
hello##
#$%&&
Strings that contain word characters:
sample
test
test23
hello##