Remove blank lines at the end of a String in Java?

Question

I get file's content as a String:

Test1 2.00 04/03/2016
Test2 2.00 04/03/2016
Test3 2.00 04/03/2016

     END

Just imagine that END is not there. I had to put it so that stackoverflow doesn't trim the blank line at the end on its own. Anyway, what would be the best way to quickly remove these blank lines just from the end of the file? Any blank lines in the middle of start of the file have to persist. Any blank spaces or tabs to the right of the text lines also have to persist.

Do you actually want to remove the blank lines in the file, or just from the Strings of the file that you read in? — Matthew Herbst, Jun 05 '16 at 23:54

score 5 · Answer 1 · answered Jun 06 '16 at 00:47

5

s = s.replaceAll("([\\n\\r]+\\s*)*$", "");

As requested, this will preserve:

empty/whitespace lines at beginning
empty/whitespace lines in middle
trailing whitespace on any non-empty line

It will remove:

empty/whitespace lines at end

answered Jun 06 '16 at 00:47

The111

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I +1 it, nice solution, if reading the whole file is a possibility. – alexbt Jun 06 '16 at 01:05
@Alex the OP's stated use case was that he has the whole file as a String. – The111 Jun 06 '16 at 01:17
true, the very first Line. My vote goes to your solution :) – alexbt Jun 06 '16 at 01:18

Remove blank lines at the end of a String in Java?

1 Answers1