<LF> is allowed in variable names

[Aacini]

Code: Select all

@echo off
setlocal EnableDelayedExpansion

set ^"line1^

=111^"

set ^"line2^

^

=23432^"

set line

rem Use Delayed Expansion to access these variables:

echo line1=!line1^

!

echo !line2^

^

:4=YES!

Output:

Code: Select all

line1
=111
line2

=23432
line1=111
23YES32

Antonio

[T3RRY]

Interesting find. Call may also be used to expand the variable:

Code: Select all

@Echo Off & Setlocal EnableDelayedExpansion

Set ^"var1^
=_1^"

Set ^"var2^
=_2^"

Set var

Call Echo/[!var1^
!]
Call Echo/[!var2^
!]

Echo/[!var1:_=Var #!]
Echo/[!var2:_=Var #!]

Echo/[!var1^
:_=Var #!]
Echo/[!var2^
:_=Var #!]

Call Echo/[!var1^
:_=Var #!]
Call Echo/[!var2^
:_=Var #!]

Output:

Code: Select all

var1=_1
var2=_2
[_1]
[_2]
[var1:_=Var #]
[var2:_=Var #]
[var1:_=Var #]
[var2:_=Var #]
[Var #1]
[Var #2]

[Aacini]

Interesting find. Call may also be used to expand the variable:

Mmmm... Two points about your code.

First, in your example the variable names have NOT a LineFeed in the name:

Code: Select all

@Echo Off & Setlocal EnableDelayedExpansion

Set ^"var1^
=_1^"

Set ^"var2^
=_2^"

Set var

echo %var1%
echo %var2%

Output:

Code: Select all

var1=_1
var2=_2
_1
_2

In the output of Set var command you can see that "var1" and "var2" are followed by an equal sign in the same line and that such a variables can be accessed in the %var1% and %var2% standard way.

To insert a LineFeed in the variable name an additional empty line must be included:

Code: Select all

@Echo Off & Setlocal EnableDelayedExpansion

Set ^"var1^

=_1^"

Set ^"var2^

=_2^"

Set var

echo %var1%
echo %var2%

Output:

Code: Select all

var1
=_1
var2
=_2
ECHO está desactivado.
ECHO está desactivado.

In second place, the Call method to expand a variable is used in combination with double percent signs; NOT with Delayed Expansion:

Code: Select all

@Echo Off & Setlocal

Set ^"var1^

=_1^"

Set ^"var2^

^

=_2^"

Set var

Call Echo %%var1^

:_=Var #%%
Call Echo %%var2^

^

:_=Var #%%

Output:

Code: Select all

var1
=_1
var2

=_2
Var #1
Var #2

In this last example note that var2 have two LineFeeds in its name.

Antonio

PS - The %standard% (one percent) expansion method don't work in this case.

[T3RRY]

All good points, I was missing the obvious in the output from the set display of the variable content, and working with the results of the the variable names that contained carets, not linefeeds.

[Sponge Belly]

See also DT: Safely Expand Any Variable by Dave Benham.