How to Remove Empty Lines from a Formatted String

How to remove empty lines from a formatted string

If you also want to remove lines that only contain whitespace, use

resultString = Regex.Replace(subjectString, @"^\s+$[\r\n]*", string.Empty, RegexOptions.Multiline);

^\s+$ will remove everything from the first blank line to the last (in a contiguous block of empty lines), including lines that only contain tabs or spaces.

[\r\n]* will then remove the last CRLF (or just LF which is important because the .NET regex engine matches the $ between a \r and a \n, funnily enough).

Remove empty line from string C#

You should replace two newline characters(if any). Following code will work on Unix as well as non unix platforms.

var stringWithoutEmptyLines = yourString.Replace(Environment.NewLine + Environment.NewLine, Environment.NewLine);

What's a quick one-liner to remove empty lines from a python string?

How about:

text = os.linesep.join([s for s in text.splitlines() if s])

where text is the string with the possible extraneous lines?

Remove empty lines in text using Visual Studio or VS Code

It's very useful especially if you want to arrange or compare codes, thanks to the people who answer this question, I've got the answer from here and would like to share it with Stackoverflow:

Visual Studio (Visual Studio Code) has the ability to delete empty lines in replace operation using regular expressions.

  • Click Ctrl-H (quick replace)

  • Tick "Use Regular Expressions"

  • In Find specify ^$\n

  • In Replace box delete everything.

  • Click "Replace All"

All empty lines will be deleted.

Regular expression for empty line consists of

Beginning of line ^

End of line $

Line break \n

Note that normally in Windows an end of line indicated by 2 characters crlf - Carriage Return (CR, ASCII 13, \r) Line Feed (LF, ASCII 10, \n).

A regex to remove blank lines that are/aren't really blank (i.e. they do/don't have spaces): ^:b*$\n

To remove double lines: ^:b*\n:b*\n replace with: \n

*** for Visual Studio 2013 and above:***

^\s*$\n

and for double lines:

^(?([^\r\n])\s)*\r?\n(?([^\r\n])\s)*\r?\n

See the regular expression syntax updates for VS2012 and above in @lennart's answer below

How to remove blank lines in middle of a string Android

String adjusted = adress.replaceAll("(?m)^[ \t]*\r?\n", "");

How do I remove multiple empty lines in a text file

You can do this:

   Dim sFile As String = "c:\test2\test2.txt"

Dim Fdata As New List(Of String)

Fdata = File.ReadAllLines("c:\test2\test.txt").ToList

For i = Fdata.Count - 1 To 0 Step -1
If Fdata(i) = "" Then
Fdata.RemoveAt(i)
End If
Next

For Each sLine As String In Fdata
Debug.Print(sLine)
Next

File.WriteAllLines(sFile)

The above would remove all blank lines

In place of that loop, you could also use lamda expression like this:

    Fdata.RemoveAll(Function(MyOneRow) MyOneRow = "")

How to remove empty lines while preserving the formatting of the richtextbox in c#

The Golden Rule about RichTextBoxes is to never change the Text directly, once it has any formatting.

To add you use AppendText and to change you need to use the Select, Cut, Copy & Paste.. methods to preserve the formatting!

string needle = "\r\r";  // only one possible cause of empty lines

int p1 = richTextBox1.Find(needle);
while (p1 >= 0)
{
richTextBox1.SelectionStart = p1;
richTextBox1.Select(p1, needle.Length);
richTextBox1.Cut();
p1 = richTextBox1.Find(needle);
}

For multiple needles you'll need to call the code multiple times, I'm afraid..

How to remove blank elements from an array of strings in C?

You should use an intermediate one-dimensional character array in the call of fgets like for example

for ( char line[LINE_SIZE]; fgets( line, LINE_SIZE, fp) != NULL; )
{
if ( line[0] != '\n' )
{
line[ strcspn( line, "\n" ) ] = '\0';
strcpy( str[i++], line );
}
}

If a line can contain blanks you can change the condition of the if statement the following way

for ( char line[LINE_SIZE]; fgets( line, LINE_SIZE, fp) != NULL; )
{
size_t n = strspn( line, " \t" );

if ( line[n] != '\n' && line[n] != '\0' )
{
line[ n + strcspn( line + n, "\n" ) ] = '\0';
strcpy( str[i++], line );
}
}

In the above code snippet you can substitute this statement

strcpy( str[i++], line );

for this statement if you want that the string would not contain leading spaces.

strcpy( str[i++], line + n );

How to remove unnecessary blank line on code formatting in Android Studio

Yes. It is possible to configure the number of blank lines in the settings menu : File -> Other Settings -> Default Settings... -> Code Style -> Java(or whatever your language is) -> Blank Lines
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