How to delete *.* excluding some extensions?

Question

I\'m trying to make a batch file on Windows for deleting all the files in the current directory but excluding 4 file extensions (log, sdb, SDK, bat).

I have tried th

Answer 1

@echo off
setlocal EnableDelayedExpansion
set exclude=.log.sdb.sdk.bat.
for %%f in (*.*) do (
   if /I "%exclude%" == "!exclude:%%~Xf.=!" del "%%f"
)