After reading text file that contain words and numbers, I split it into words and numbers and left with blank lines in both splited words and numbers.

I try to remove the blank lines but the code did'nt work. Someone can help

 String textfile = read.next();

 String[] words = textfile.split("\\d");
 String[] numbers = textfile.split("[^0-9]");

 StringBuffer splitedwords = new  StringBuffer();

 StringBuffer splitednumbers = new StringBuffer();

  for(int k = 0; k<numbers.length; k   )

  {

    splitednumbers.append(numbers[k]);

 String remove_blank_lines_of_splitednumbers = splitednumbers.toString();


   remove_blank_lines_of_splitednumbers.replaceAll("[\r\n]{2,}",  "");

 System.out.println(remove_blank_lines_of_splitednumbers);

  }

Igot this output

13
46
16

   

   


 08
 96
 11






 150
 200
 379

I want the output to be

 13
 46 
 16
  08
  96
  11
  150
  200
  379

CodePudding user response：

If you need to remove white spaces, such as your empty lines, at the beginning or end of a String you can simply use the trim method instead of restorting to a replace with a regex.

If you'll aplly a trim on each numbers[k] in your for you should be able to remove every white characters around them.

splitednumbers.append(numbers[k].trim());

Or try still the replaceAll withe a regex matching white spaces.

splitednumbers.append(numbers[k].replaceAll("\\s ", ""));

CodePudding user response：

Maybe you should still try with a replaceAll but using the \s character class though. I don't think this code (replaceAll("[\r\n]{2,}", ""); can detect you new lines and carriage return the way you expect.