import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Main {
public static void main(String[] argv) throws Exception {
CharSequence inputStr = "a\r\rb"; // Mac
//inputStr = "a\r\n\r\nb"; // Windows
//inputStr = "a\n\nb"; // Unix
String patternStr = "(^.*\\S+.*$)+";
Pattern pattern = Pattern.compile(patternStr, Pattern.MULTILINE);
Matcher matcher = pattern.matcher(inputStr);
while (matcher.find()) {
String paragraph = matcher.group();
}
}
}