Batch string space removal implementation code [different parts]

CopyCode The Code is as follows: @ echo off
: Remove the left space.
::
::
Set "str = AB C &>! "
For/F "tokens = *" % I in ("% STR %") Do echo "☆% % I ☆"
Pause
Goto: EOF

@ Echo off
: Remove the left space.
::
::
Set "str = AB C &>! "
: Intercept
If "% STR :~ 0,1% "=" "set" str = % STR :~ 1% "& goto intercept
Echo "☆% STR % ☆"
Pause
Goto: EOF

@ Echo off
: Remove the right space
::
::
Set "str = AB C &>! "
: Intercept
If "% STR :~ -1% "=" "set" str = % STR :~ 0,-1% "& goto intercept
Echo "☆% STR % ☆"
Pause
Goto: EOF

@ Echo off
: Remove spaces at the beginning and end
::
::
Set "str = AB C &>! "

: Intercept_left
If "% STR :~ 0,1% "=" "set" str = % STR :~ 1% "& goto intercept_left

: Intercept_right
If "% STR :~ -1% "=" "set" str = % STR :~ 0,-1% "& goto intercept_right
Echo "☆% STR % ☆"
Pause
Goto: EOF

@ Echo off
: Remove all spaces
::
::
Set "str = AB C &>! "
Set "str = % STR: = %"
Echo "☆% STR % ☆"
Pause
Goto: EOF

@ Echo % dbg % off
CLS & Echo. & Echo.
: Demonstration of variable tests and alternative methods for removing left and right spaces in redtek 2006
: It is convenient for demonstration and other functions, so the code in the "tag code segment" can be used independently.
::

Set "Var = My Name Is redtek"
Rem note: the parameters in the following call are not enclosed in quotation marks. The parameters are separated by commas (,) and spaces.
Call: remove the left space % var %
Echo. & Echo.
Call: remove the right space "% var %"
Rem removes the Left and Right spaces in the string
For the convenience of demonstration and other functions, the following steps re-compile the code segment with left and right spaces, which can be used independently.
Echo. & Echo.
Call: remove the space "% var %" % var %
Goto: EOF

: Left-side Space

Rem uses the replacement principle to replace everything on the left of the string starting with ^ % 1 in the variable VAR with ^ 1 itself.
Rem, because after being called, all spaces in the parameters are "lost" (using the feature of parameter separation ),
Rem, the space on the left of ^ % 1 to be located is gone.

Call set "variables after left space removal =%% var: * % 1 = % 1% %

Echo original string: [% var %]
Echo string after left space removal: [% variable after left space removal %]
Goto: EOF

: Right-side Space

Rem assigns the result to the variable, which can be called at will.
Rem ~ NX uses the feature of "extending a variable to a file name,
Since REM is a valid file name, the space behind the file name is invalid and useless ~ :)

Set variable after right space removal = % ~ Nx1

Echo original string: [% var %]
Echo: [% variable % after right space removal]
Goto: EOF

: Remove spaces on both sides

Rem principle: first go to the left space and then to the right space, which is equivalent to the use of the above DEMO code :)
The following is an independent demonstration of REM without the code for removing spaces from the left and right in the preceding two sections:

Set variables after spaces are removed from left and right = % ~ Nx1
Call set "variables with spaces between left and right =%% variables with spaces between left and right: * % 2 = % 2% %"

Echo original string: [% var %]
Echo string after left and right spaces: [% variable after left and right spaces]
Goto: EOF