public class Main
{
   public static void main(String[] args) throws Exception
   {
      String string = "This is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.\nThis is a string.s";
      String regex = "(.* .* .*\\.(\r?\n|$))*+";
      System.out.println(string.matches(regex));
   }
}

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