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import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Test{
public static void main(String[] args){
String content = "bbb,,,";
String regex = "(?<=^|,)[^,]*(?=,|$)";
Matcher matcher = Pattern.compile(regex).matcher(content);
int index = 1;
while(matcher.find()){
System.out.printf("%d:'%s'%n",index++,matcher.group(0));
}
}
}