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How to trim whitespace from a string?

Posted on 2008-10-15
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Last Modified: 2012-05-05
Hello,

I'm trying to trim whitespace from a string variable.  I've figured out how to left trim, but can't figure out how to right trim.  There are some examples on the web, but to work they make assumptions like the maximum length of string, or that it won't contain 2 # symbols together.  I can't make this assumption so would need it to be fail safe.

In short, I need a solution to trim spaces from the right end of the string.

My code is shown below, with the left trim working.

Many thanks,
Steve
--

:trim
 
rem --- Set variable and remove any surrounding quotes
set _string=%~1
 
rem --- Remove whitespace at left
for /F "tokens=*" %%s in ("%_string%") do set _trimmed=%%s
 
rem --- Remove whitespace at right
 
 
echo [%_trimmed%]
goto :eof

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Question by:sda100
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8 Comments
 
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Expert Comment

by:Steve Knight
ID: 22720311
Just use this concept:

set _trimmed=%_string: =%

where it replaces space with nothing (i.e. removes)

e.g.

set datewithdashes=%date:/=-%

hth

Steve
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LVL 43

Expert Comment

by:Steve Knight
ID: 22720354
Ignore that, misread question!
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Expert Comment

by:Steve Knight
ID: 22720400
if you can use a VBS you could get that to do it:

REM trim.vbs
wscript.echo trim(wscript.arguments(0))

@echo off
set _string=%~1
for /f "tokens=*" %%a in ('cscript //nologo trim.vbs "%_String%"') do set _trimmed=%%~a
echo %_trimmed%

but can't think of easy batch way without a lot of fiddling

Steve
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LVL 43

Expert Comment

by:Steve Knight
ID: 22720418
Ahh actually thinking about it again...

@echo off
set _string=%~1
:loop
 if not "%_string:~-1%"==" goto :next
 set _string=%_string:0,-1%
 goto loop
:next
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Accepted Solution

by:
Steve Knight earned 1000 total points
ID: 22720485
Not doing well today, that was previous attempt:

@echo off
set _string=%~1
set _trimmed=%_string%
:loop
 if not "%_trimmed:~-1%"==" " goto next
 set _trimmed=%_trimmed:~0,-1%
 goto loop
:next
echo %_trimmed%X
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Expert Comment

by:Steve Knight
ID: 22720508
Add this in as an alternative to the ltrim too if you wish:

:loop2
 if not "%_trimmed:~0,1%"==" " goto next2
 set _trimmed=%_trimmed:~1%
 goto loop2
:next2

Steve
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Author Closing Comment

by:sda100
ID: 31506274
Thanks Steve,

I actually came up with the exact same solution before I came back to this question, but it did take me 2 hours - not 2 minutes!

Steve :)
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Expert Comment

by:Steve Knight
ID: 22721181
haha, no problem at least you got yourself a solution.

Steve
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