//Sample18_22_pm.java
import java.util.regex.Pattern;
class Sample18_22_pm{

    public static void main(String[] args){
      String regex = "a*bcdefg";
      System.out.println(regex);
      System.out.println("----------");
      Pattern p = Pattern.compile(regex);

      String[] strs = {
        "bcdefg",
        "abcdefg",
        "aabcdefg",
        "aaabcdefg",
        "ababcdefg"
      };
      boolean boo;

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