//Sample18_21_pm.java
import java.util.regex.Pattern;
class Sample18_21_pm{
    public static void main(String[] args){

      String regex = "abcd.fg";
      System.out.println(regex);
      System.out.println("----------");
      Pattern p = Pattern.compile(regex);

      String[] strs = {
        "abcdefg",
        "aabcdefg",
        "abcdxxfg",
        "abcdxf"
      };
      boolean boo;

      for(String str : strs){
        boo = p.matcher(str).find();
        //boo = str.matches(regex);
        System.out.println(str + "\t" + boo);
      }
    }
}