How to count a special character in a string with window batch?

Thanks for the info. However I need a count of how many '\' there are in the str. How to get it?

No points for me on this one, but I sometimes use a FOR /L for this one oBdA to avoid GOTO.  I really don't like those because they have to read each line of the script from the top to find the label.  I tend to use EXIT /B rather than GOTO :EOF for that reason, although I have no sure way of knowing if GOTO is smart enough to handle :EOF special and fast.

I know we think of things a little differently from time to time, I enjoy that about reading your posts.  I decided to give up the SETLOCAL in the sub (even though I like that!) and instead directly access the result variable in the loop adding to it real time.  As a result I had to clear out the one variable needed by the sub on exit.  Anyway, just wanted to share a slightly different approach, but you already provided a viable approach, this was more for tinkering for me.

:GetCharCount <Variable> <string> <Char>
  set _S=%~2
  set /a %~1 = 0
  for /L %%i in (0,1,10000) do (
    if "!_S:~%%i,1!"=="" (set "_S=" & exit /b)
    if /i "!_S:~%%i,1!"=="%~3" set /a %~1 += 1
  )
  set "_S="
  exit /b

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~bp

Excellent! Thanks for bp's comment.