command line - How can I determine whether a Windows XP cmd variable ends with a given string?

I want to check on whether the last character(s) of an environment variable are \ or .exe. How can I do this in Windows XP SP3?

Answer

To use substrings:

set _parm1=foo.exe
if [%_parm1:~-1%]==[\] echo ends with \
if /i [%_parm1:~-4%]==[.exe] echo ends with .exe

You replace the number before the % sign to alter how many characters it checks at the end of the string.