How do i remove empty lines from a string? I have tried some_string = some_string.gsub(/^$/, "");
and much more, but nothing works.
2
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possible duplicate of Ruby : Trim New blank linesbragboy– bragboy2011-09-07 19:14:22 +00:00Commented Sep 7, 2011 at 19:14
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2it's not a duplicate. that title is very misleadingKaroly Horvath– Karoly Horvath2011-09-07 19:16:55 +00:00Commented Sep 7, 2011 at 19:16
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5 Answers
Remove blank lines:
str.gsub /^$\n/, ''
Note: unlike some of the other solutions, this one actually removes blank lines and not line breaks :)
>> a = "a\n\nb\n"
=> "a\n\nb\n"
>> a.gsub /^$\n/, ''
=> "a\nb\n"
Explanation: matches the start ^ and end $ of a line with nothing in between, followed by a line break.
Alternative, more explicit (though less elegant) solution:
str.each_line.reject{|x| x.strip == ""}.join
1 Comment
einjohn
It depends on the definition of elegant; one might argue that the more explicit solution is the more elegant! :)
squeeze (or squeeze!) does just that - without a regex.
str.squeeze("\n")
1 Comment
steenslag
@janechii
hello \n is not ` hello followed by a blank line, it is " hello" followed by a line ending.Replace multiple newlines with a single one:
fixedstr = str.gsub(/\n\n+/, "\n")
or
str.gsub!(/\n\n+/, "\n")
Comments
You could try to replace all occurrences of 2 or more line breaks with just one:
my_string.gsub(/\n{2,}/, '\n')
Comments
Originally
some_string = some_string.gsub(/\n/,'')
Updated
some_string = some_string.gsub(/^$\n/,'')
