China DOS Union

I think the poster was lxmxn?
It analyzed set substring extraction by position in great detail. I forget whether it used %time% or %date% or a string as the example!
The rough content was like this:
set=1234567890
Take the first character 1, the second 2, the third 3, and so on...
I think it also talked about replacing content...
Now I can't find that thread anywhere

set /? seems to have it


Environment variable substitution has been enhanced as follows:

%PATH:str1=str2%

This expands the PATH environment variable, replacing each occurrence of "str1"
in the expanded result with "str2".
To effectively delete all occurrences of "str1" from the expanded result, "str2"
can be empty.
"str1" can begin with an asterisk; in that case, everything from the
beginning of the expanded result up to the first occurrence of the remainder
of str1 is kept matched.

You can also specify substrings for the expansion.



%PATH:~10,5%

This expands the PATH environment variable, then uses only the five characters
starting with the 11th character (offset 10) in the expanded result. If length
is not specified, the default value is the remainder of the variable value. If
both numbers (offset and length) are negative, the numbers used are the length
of the environment variable value plus the specified offset or length.

%PATH:~-10%

This extracts the last ten characters of the PATH variable.

%PATH:~0,-2%

This extracts all characters of the PATH variable except the last two.