How to split a string by spaces in a Windows batch file?

The following code will split a string with an arbitrary number of substrings:

@echo off
setlocal ENABLEDELAYEDEXPANSION

REM Set a string with an arbitrary number of substrings separated by semi colons
set teststring=The;rain;in;spain

REM Do something with each substring
:stringLOOP
    REM Stop when the string is empty
    if "!teststring!" EQU "" goto END

    for /f "delims=;" %%a in ("!teststring!") do set substring=%%a

        REM Do something with the substring - 
        REM we just echo it for the purposes of demo
        echo !substring!

REM Now strip off the leading substring
:striploop
    set stripchar=!teststring:~0,1!
    set teststring=!teststring:~1!

    if "!teststring!" EQU "" goto stringloop

    if "!stripchar!" NEQ ";" goto striploop

    goto stringloop
)

:END
endlocal

If someone need to split a string with any delimiter and store values in separate variables, here is the script I built,

FOR /F "tokens=1,2 delims=x" %i in ("1920x1080") do (
  set w=%i
  set h=%j
)
echo %w%
echo %h%

Explanation: 'tokens' defines what elements you need to pass to the body of FOR, with token delimited by character 'x'. So after delimiting, the first and second token are passed to the body. In the body %i refers to first token and %j refers to second token. We can take %k to refer to 3rd token and so on..

Please also type HELP FOR in cmd to get a detailed explanation.