Remove quotes from named environment variables in Windows scripts

echo %myvar:"=%

This is not a limitation of the environment variable, but rather the command shell.

Enclose the entire assignment in quotes:

set "myvar=http://example.com?foo=1&bar="

Though if you try to echo this, it will complain as the shell will see a break in there.

You can echo it by enclosing the var name in quotes:

echo "%myvar%"

Or better, just use the set command to view the contents:

set myvar

While there are several good answers already, another way to remove quotes is to use a simple subroutine:

:unquote
  set %1=%~2
  goto :EOF

Here's a complete usage example:

@echo off
setlocal ENABLEDELAYEDEXPANSION ENABLEEXTENSIONS

set words="Two words"
call :unquote words %words%
echo %words%

set quoted="Now is the time"
call :unquote unquoted %quoted%
echo %unquoted%

set word=NoQuoteTest
call :unquote word %word%
echo %word%

goto :EOF

:unquote
  set %1=%~2
  goto :EOF

This works

for %a in (%myvar%) do set myvar=%~a

I would also use this if I wanted to print a variable that contained and ampersand without the quotes.

for %a in ("fish & chips") do echo %~a