Batch file: how to call <label> with parameter with & inside?

I have this batch:
set p=abcde
call :mysub %p%
exit /b
:mysub
echo %1

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and it works as expected. But if instead of abcde I have a string with & inside,
set p=ab&de
call :mysub %p%
exit /b
:mysub
echo %1

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it does not work, as I understand because & is interpreted as escape character. I tried to put various numbers of ^ before & in line 1, but nothing works.

How to get it to work so parameter %1 gets the actual string ab&cd ?
LVL 40
Vadim RappAsked:
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
First error: Your set is already failing, only setting p  to ab and then trying to execute de.
Next issue: You need to add ^^ for each instance of providing the value as a string. But that is dangerous, and behaviour strange if not using the correct amount of carets.
One way to get a half-way decent result is:
set "p=ab&de"
call :mysub "%p%"
exit /b
:mysub
echo "%~1"

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but in fact it is very difficult to correctly treat some characters in a batch file, because of the simple string replacement strategy it uses. Switch to PowerShell or VBS for such cases ;-).
0
 
Randy PooleCommented:
Give this a try
set p=ab^&de
call :mysub %p%
exit /b
:mysub
echo %1

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0
 
Steve WhitcherSystems AdministratorCommented:
Instead of escaping out the individual character, try wrapping the string in double quotes.  For example:

set p="ab&de"
call :mysub %p%
exit /b
:mysub
echo %1

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Edit: Actually, I just tested and found that didn't behave as I expected, sorry.  
Instead, include the variable name in the quotes as well, like this:

set "p=ab^&de"
call :mysub %p%
exit /b
:mysub
echo %1

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