RegTest1

import java.util.regex.*;
import java.util.*;
class RegTest1{
    public static void main(String[] args){
        String expression=args[0],
               source=args[1];
        Pattern p=Pattern.compile(expression);
        Matcher m=p.matcher(source);
        List<Integer> posiciones=new ArrayList<>();

        System.out.println("expression:" +m.pattern());
        System.out.println("source:" +expression);
        System.out.println(" index:012345678901234567890" );
        System.out.println("       0         1         2\n" );
        System.out.println("match positions:");
        while(m.find()){
            int pos=m.start();
            System.out.print(pos+" ");
            posiciones.add(pos);
        }
        System.out.println("\n\nCon marcas:");
        m.reset(); //reinicio la búsqueda para mostrar las marcas
        System.out.println("source:" +source);
        System.out.println(" index:012345678901234567890" );
        System.out.print("       ");
        for(int i=0;i<source.length();i++)
            System.out.print(posiciones.indexOf(i)>=0?'*':' ');




    }
}