From: klee@unibwm.de   
      
   On 22.05.2020 16:30, Tom Del Rosso wrote:   
   > The objective is to remove everything except digits 0-9 from a string.   
   >   
   > %alpha_substrings% does contain all possible non-numeric substrings   
   > (space separated), so this should remove them and leave only the digits.   
   >   
   > set "only_numbers=string"   
   > for %%t in (%alpha_substrings%) do (   
   >          call set "only_numbers=%%only_numbers:%%t= %%"   
   > )   
   >   
   > But some characters in the non-numeric substrings, like =, don't get   
   > removed because they are never included in %%t.   
      
   If there is only a problem with "=" you can use:   
      
   @echo off   
   set a=3x3=4+5 = 1 + 8   
   echo %a%   
      
   set b=   
   for %%i in (%a%) do call set b=%%b%%%%i   
   echo %b%   
      
   set d=%b%   
      
   set c=   
   :loop   
   for /f "tokens=1* delims=0123456789" %%i in ("%b%") do set c=%c% %%i&set b=%%j   
   if not [%b%]==[] goto :loop   
   echo %c%   
      
   for %%i in (%c%) do call set d=%%d:%%i=%%   
      
   echo %d%   
      
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