/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.*;
/* 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
	{
		String str = "String prefix without commas, variable length remainder with optional suffix (optional suffix)";
    	Pattern ptrn = Pattern.compile("^([^,]*),([^()]*)(\\s*\\(.*\\))?$");
    	Matcher matcher = ptrn.matcher(str);
    	while (matcher.find()) {
    		System.out.println("First group: " + matcher.group(1)
    		              + "\nSecond group: " + matcher.group(1) 
    		             + (matcher.group(3) != null ? "\nThrid group: " + matcher.group(3) : ""));
    	}
	}
}

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