import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
public class Main
{
   public static void main(String[] args)
   {
      products("{1,3}{4,5}{6,7}");
      products("not valid string");
   }
private static void products(final String products) {
    final String regex = "(?:\\{([0-9]+),([0-9]+)\\})";
 
 
    final java.util.regex.Pattern pAll = java.util.regex.Pattern.compile(regex+"+");
 
    if(!pAll.matcher(products).matches()) {
        throw new IllegalArgumentException("Wrong semantic of products!");
    }
 
    final java.util.regex.Pattern p = java.util.regex.Pattern.compile(regex);
    final Matcher matcher = p.matcher(products);
 
    while(matcher.find()) {
        System.out.print(matcher.group(1) + " ");
        System.out.println(matcher.group(2));
    }
}
}

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