import java.util.*;
import java.util.regex.*;
 
class Test
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String text = "asd ${ITEM_NAME} asd ${KEK} asdasd ${ITEM_NAME_2} \n ${ITEM_NAME} asd ${KEK} asdasd ${ITEM_NAME_2}";
		Pattern p = Pattern.compile("\\$\\{([^{}]*)}");
	    Matcher m = p.matcher(text);
	    Set<String> res = new HashSet<>();
	    while(m.find()) {
	    	res.add(m.group(1));
	    }
	    System.out.println(res);
	}
}

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