Program for Character Classes

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class CharacterClasses
{
   public static void main(String[] args) {
   Scanner sc=new Scanner(System.in);
   System.out.println("Enter a string ");
   String x=sc.nextLine();
Pattern p=Pattern.compile(x);
Matcher m=p.matcher("a7b@z#9");
while(m.find())
{
System.out.print(m.group());
}

}
}