How do I remove trailing whitespace using a regular expression

Question

I want to remove trailing white spaces and tabs from my code without  removing empty lines   I tried    s     and       n    s  r n   But they all removed empty lines too  I guess  s matches end-of-line characters too     UPDATE  2016    Nowadays I automate such code cleaning by using Sublime s TrailingSpaces package  with custom user setting    trailing spaces trim on save   true   It highlights trailing white spaces and automatically trims them on save

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If using Visual Studio 2012 and later  which uses  NET regular expressions   you can remove trailing whitespace without removing blank lines by using the following regex  Replace       r n   s    r  n   With  1      Some explanation  The reason you need the rather complicated expression is that the character class  s matches spaces  tabs and newline characters  so  s  will match a group of lines containing only whitespace  It doesn t help adding a   termination to this regex  because this will still match a group of lines containing only whitespace and newline characters   You may also want to know  as I did  exactly what the       r n   s  expression means  This is an Alternation Construct  which effectively means match to the whitespace character class if it is not a carriage return or linefeed   Alternation constructs normally have a true and false part       expression   yes   no    but in this case the false part is not specified

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To remove trailing whitespace while also preserving whitespace-only lines  you want the regex to only remove trailing whitespace after non-whitespace characters  So you need to first check for a non-whitespace character  This means that the non-whitespace character will be included in the match  so you need to include it in the replacement   Regex       t r n     t     Replacement   1 or  1  depending on the IDE

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You can simply use it like this    x000D   x000D  var regex        g  x000D   x000D   x000D    Sample  click here

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In Java     String str        hello world         prints  hello world   System out println str replaceAll      s      s

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To remove trailing white space while ignoring empty lines I use positive look-behind      lt   S  s     The look-behind is the way go to exclude the non-whitespace   S  from the match

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t    with an empty replace works   s     with a  1 replace also works  At least in Visual Studio Code

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The platform is not specified  but in C    NET  it would be  Regular expression  presumes the multiline option - the example below uses it          t    r     Replacement       1   For an explanation of  quot  r   quot   see Regular Expression Options  Multiline Mode  MSDN   Code example This will remove all trailing spaces and all trailing TABs in all lines  string inputText    quot      Hello  World    r n quot                        quot   Some other line r n quot                        quot      The last line   quot   string cleanedUpText   Regex Replace inputText                                         quot    t    r    quot     quot  1 quot                                        RegexOptions Multiline

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Regex to find trailing and leading whitespaces       t      t

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To remove any blank trailing spaces use this    n   s  n   I tested in the Atom and Xcode editors

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Try just removing trailing spaces and tabs      t

[regex] How do I remove trailing whitespace using a regular expression?

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