/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
 
/* 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
	{
		Pattern TEST_PATTERN =  Pattern.compile("namespace=\\[[A-Z_]+]");
		String testString = "namespace=[SOCIAL_STREAM_MUTATE] id=[a19]";
		Matcher matcher = TEST_PATTERN.matcher(testString);
		if(matcher.find()) {
 
			System.out.println("Match found " + matcher.group(0) + " " + matcher.start(0) + " " + matcher.end(0));
 
		}
		// your code goes here
	}
}

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