/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		final String regex = "(?<=^(?:.{3}|.{4}|.{5})).";
		final String string = "AD-BJR5U";
		final String subst = "*";
 
		final Pattern pattern = Pattern.compile(regex);
		final Matcher matcher = pattern.matcher(string);
 
		// The substituted value will be contained in the result variable
		final String result = matcher.replaceAll(subst);
 
		System.out.println("Substitution result: " + result);
	}
}

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