/* 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
	{
		// your code goes here
		String REGEX = "\\{[^}]*\\}";
        String INPUT = "This is a test {replace_me}. And this is another {replace_me_too}.";
        String REPLACE = "xxx";
       Pattern p = Pattern.compile(REGEX);
       // get a matcher object
       Matcher m = p.matcher(INPUT); 
       INPUT = m.replaceFirst(REPLACE);
       System.out.println(INPUT);
	}
}

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